DESC:TECHNICAL FIELD
[0001] The present disclosure generally relates to a calculator for use with merchants. More particularly, the present disclosure relates to a Smart Calculator Point of Sale device that operates on platforms, such as Android™, and is capable of performing various programmable functions.

BACKGROUND
[0002] With the ever-increasing demand in digital technology, secure transactions and merchant utility tools have been the focus of many consumer products as well as services of wireless providers. For example, in the payment industry, security is at the forefront. The world has been moving towards cashless society. Consumers are relying predominantly on non-cash-based payments. As the payment option moves from physical mode to virtual mode, the payment-processing industry faces two main challenges based on the current market trends such as user identification and integration management. Single focused payment devices typically do not serve any other purpose other than payment acceptance. With the availability of various payment options other than cards, different customers may opt for different modes of payments. Amid various payment options, it becomes challenging for a merchant to keep track details of all transactions.
[0003] Although digital payment or e-payment is a fast and convenient way to make payments as compared to cash payments, in developing countries not all customers, are comfortable to opt for digital mode of payment. Many customers still rely on paying in cash for services or products purchased by them. In such a scenario, it becomes difficult for merchants, shopkeepers/shop-owners, to maintain records of various cash and/or cash less payments and transactions, and to compile them to give an accumulated revenue amount. So far, the merchant has had to work with a pen, a book, such as a notepad, a calculator, different payment machines/apps for recording on account sales and amounts due, etc. Further, if digital payment or e-payment were opted for, thus far, the merchant was required to procure one or more expensive devices to be able to accept payments made using the various forms of virtual payment systems. On some occasions, merchants were also required to follow up with their customers for payments due via phone or visit.

SUMMARY
[0004] In an aspect of the present disclosure, a smart calculator is provided herein. The smart calculator includes a display unit, a transaction unit, a control unit, a processing unit and a memory unit. The display unit is configured to display an output related to one or more payment transactions performed by the smart calculator. The transaction unit includes a number of user actuatable buttons corresponding to a plurality of modes of payment transactions. The control unit includes a number of user actuatable buttons for performing arithmetic and numeric calculations. The processing unit is operatively coupled to the display unit, the transaction unit and the control unit. The processing unit is configured to selectively perform one or more of the payment transactions or arithmetic and numeric calculations based on a user input received via one of the transaction unit or the control unit.

BRIEF DESCRIPTION OF THE DRAWINGS
[0005] The following is a brief description of the various embodiments with reference to the accompanying drawings. It is to be understood that the features illustrated in and described with reference to the drawings are not to be construed as limiting the scope of the invention. In the accompanying drawings:
[0006] FIG. 1 illustrates an exemplary Smart Calculator in accordance with an embodiment of the present disclosure; and
[0007] FIG. 2 illustrates a block diagram of a Smart Calculator system, according to the various embodiments of the present disclosure.

DESCRIPTION
[0008] Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
[0009] The present disclosure relates to a calculator 100 that, in general, may be used by merchants for carrying out a number of financial transactions. According to the various embodiments of the present disclosure, the calculator 100 is in the form of a handheld calculator device and/or may include a processing machine primarily in the shape of a calculator. According to one or more aspects of the present disclosure, the calculator 100 is a Smart Calculator Point of Sale device 100, hereinafter interchangeably referred to as the Smart Calculator 100, that enables various types of financial transactions for accomplishing additional functions as well as connecting or interfacing with peripheral or related equipment. The Smart Calculator 100 provides a user-friendly interface to integrate other units, enter, store and execute commands and programs which facilitates financial transactions and assist in sales analytics. The Smart Calculator 100 can also perform arithmetic calculations.
[0010] The Smart Calculator 100 provides a real time access to transaction data. A merchant can review and analyze the data for implementing future strategies related to purchase and sales of the services and the product. The Smart Calculator 100 is developed keeping in focus ease of use by customizing various options and integrating various options in one unit.
[0011] Referring to FIG. 1, an exemplary form of a Smart Calculator 100 is described and illustrated. The Smart Calculator 100 comprises a Touch Enabled Display unit 102, a Cast bezel 104, a Transaction unit 106, a Control unit 108, a Numeric unit 110, and a Function unit 112. The Smart Calculator 100 may be used for performing one or more types of payment transactions along with arithmetic calculations.
[0012] In an embodiment of the present disclosure, the Smart Calculator 100 possesses a rectangular profile with circular edges as shown in FIG. 1. The Touch Enabled Display unit 102 may be positioned in the upper part of the Smart Calculator 100. The Touch Enabled Display unit 102 is further protected with a Cast bezel 104 as shown in FIG. 1. The Transaction unit 106 may be positioned below the Touch Enabled Display unit 102 and above the Control unit 108, Numeric unit 110, and the Function unit 112. The Smart Calculator 100 comprises of a plurality of buttons to facilitate different modes of payment. In an embodiment, the Smart Calculator 100 (i.e., the Transaction unit 106) includes specific payment mode buttons corresponding to various types of payment modes for the user to choose from. For example, the transaction unit 106 may include a Cash button 202, a Card button 204, a Quick Response/Unified Payments Interface button (or a QR/UPI button) 206, a Link button 208, a Digital Wallet button 210, an Account button 212, a Money transfer (MT) button 214, a Bill payment (BP) button 216, as shown in FIG. 1. It may be contemplated that the transaction unit 106 may include additional or fewer buttons without deviating from the scope of the claimed subject matter.
[0013] A Smart Calculator system 200 for the Smart Calculator 100 is illustrated in FIG. 2. In an embodiment of the present disclosure, all the components of the Smart Calculator System 200 may be positioned within the smart calculator 100. Alternatively, some components of the Smart Calculator System 200 may be provided within the Smart Calculator 100 and some components may be provided remotely with respect to the Smart Calculator 100.
[0014] The Smart Calculator system 200 includes a Control system 101, various units that can be integrated with the Control system 101 and a Database system 121. The Control system 101 comprises of an Input/output unit 103, (hereinafter referred to as I/O unit 103), a Memory unit 105, a Communication unit 107, and a Processing unit 109. The I/O unit 103 is configured to receive and store data into the Memory unit 105, received from various external source devices connected to the Smart Calculator 200 via a communication network 300. The external source devices, for example, may include, but not limited to, POS (Point of Sale) device 123, mobile device 125 or any remote payment website 127 as illustrated in FIG. 2. The I/O unit 103 is also responsible for displaying data on the Touch Enabled Display unit 102 of the Smart Calculator 100. To receive or send data, the I/O unit 103 establishes a connection with various sources via the network 300 with the help of communication unit 107.
[0015] The processing unit 109 is operatively coupled to the various other components of the Smart Calculator 100, such as the touch enabled display unit 102, the transaction unit 106 and the control unit 108. In an embodiment of the present disclosure, the processing unit 109 includes a number of modules coupled to the buttons provided on the transaction unit 106 corresponding to the various modes of payments available to the user. For example, the processing unit 109 includes a Cash module 111 coupled to the Cash button 202, a Card module 113 coupled to the card button 204, a QR module 115 coupled to the QR/UPI button 206, a Link module 117 coupled to the link button 208, a Digital wallet module 119 coupled to the Digital Wallet button 210, an Account module 140 coupled to the Account button 212, an MT module 142 coupled to the MT button 214, and a BP module 144 coupled to the BP button 216. These modules are activated when their respective buttons are pressed on the Smart Calculator 100. These modules further communicate with the I/O unit 103, Memory unit 105, various sources, and Database system 121. The modules are configured to take care of the processing required for the one or more payment transactions performed by the user.
[0016] The Database system 121 of the Smart Calculator system 200 includes various databases for example but not limited to, Cash database 114, Card database 116, QR database 118, Link database 120, Wallet database 122, Merchant database 124, Customer database 126, Revenue database 128, Account database 130, MT database 132, and BP database 134, etc. In an embodiment of the present disclosure, the memory unit 103 is configured to store all the information and data related to each of the performed payment transactions into one of the databases of the Database System 121.
[0017] In application, the Smart Calculator 100 includes a default mode in which the merchant can perform regular calculations by use of the numeric unit 110 on the Smart Calculator 100. On achieving a final amount pertaining to a transaction, the merchant may choose between the various payment option types – Cash, Card, Khata (described further below), Link, or QR, etc., to enable related transactions. Based on the option type chosen, the Smart Calculator 100 may prompt the merchant to enter additional details, as described separately below, in each payment step.
[0018] In an embodiment, the cash button 202 is configured to be used when a customer prefers to pay for the services or products in cash. In a scenario, when the merchant has carried out the calculations and has arrived at the final amount on the Smart Calculator 100, the merchant may press the cash button 202, and, accordingly, the request is transferred to the processing unit 109. The Processing unit 109 identifies the mode of payment chosen by merchant as cash mode and thereafter, cash module 111 is activated. Cash module 111 transmits a message on the Touch Enabled Display unit 102 via Communication unit 107. The message prompts the merchant to enter customer mobile number (optional) using Numeric unit 110 on the Smart Calculator 100. After the number is entered by the merchant, the amount is stored in the Cash database 114 and an SMS based receipt is sent to the customer confirming the store name and the amount. Cash module 111 also provides the option of calculating change due to be paid to the customer. The calculated change is displayed on the Touch Enabled Display unit 102 to be paid back to the client. In a case when customer changes his mind and wishes to pay via other modes of payment available instead of cash payment, the merchant can switch the option by pushing other payment option buttons available on the Smart Calculator 100.
[0019] In an embodiment, the Card button 204 enables the merchant to receive the payment by card instead of cash payment. In a scenario, when the merchant has carried out the calculations and has arrived at the final amount on the Smart Calculator 100, Card button 204 is pressed by the merchant. The Processing unit 109 identifies the mode of payment as card payment and thereafter card payment module 113 (hereinafter referred to as Card module 113) is activated. The Card module 113 may provide various options of the card to the merchant through which payment can be made. The options may be previously stored options in the Card database 116. When the merchant selects the option of Card with the help of the Card button 204 on the Smart Calculator 100, the Card module 113 transmits the message via Communication unit 107 to the Touch Enabled Display unit 102. The Touch Enabled Display unit 102 displays the message and prompts the merchant to enter optional fields such as customer mobile and or a unique reference number. Once the merchant enters the above details, the Card module 113 activates a built-in Near Field Communication™ (NFC) Module 150 within the Smart Calculator 100 and also establishes the connection with a periphery POS (Point of Sale) device 123 with the help of Communication unit 107. The connection can be established by any method, for example, but not limited to, Wireless Fidelity™ (WiFi), using SIM, Bluetooth™, Serial cable, (On-the-Go) OTG cable, USB cable etc. Thereafter, the POS device 123 completes the transaction in known method existing in the prior art. If the customer chooses to use the NFC function, the customer may tap his card on the Smart Calculator 100 directly which will in turn detect the card details and continue to process the transaction. In certain scenarios, based on the regulation, the customer may be prompted to enter a PIN which can be entered on the touch enabled Display screen of the Smart Calculator 100 that will be enabled with a PIN on glass™ technology.
[0020] In some embodiments, dedicated buttons on the Smart Calculator 100 may be provided corresponding to each of Wireless Fidelity™ (WiFi), SIM connection, Bluetooth™, Near Field Communication™ (NFC), etc., so as to enable/disable each of said techniques of communication. As one example, the Smart Calculator 100 includes a WiFi button 218 that may be pressed/re-pressed to activate/deactivate a corresponding WiFi module (not shown) of the Smart Calculator 100, a SIM button 220 that may be pressed/re-pressed to activate/deactivate a corresponding SIM connection module (not shown) of the Smart Calculator 100, a Bluetooth button 222 that may be pressed/re-pressed to activate/deactivate a corresponding Bluetooth module (not shown) of the Smart Calculator 100, and an NFC button 224 that may be pressed/re-pressed to activate/deactivate the built-in NFC module 150 of the Smart Calculator 100.
[0021] The amount paid is stored by the Card module 113 in the Card database 116. After the transaction is completed successfully, the connection with the POS device 123 is terminated. One function of Card module 113 is to generate proactive alerts. The alerts are generated in case when no connection is established between Control system 101 and POS device 123. The alerts may also be generated in case of disputed transactions or rollback transactions, etc.
[0022] In some embodiments, the card module 113 may process payments via PIN on Glass™ technology. For this purpose, and as an example, the Smart Calculator 100 may be coupled to or be engaged with a card reader into which a credit card or a debit card may be inserted, or swiped, while the card holder’s PIN may be typed into the numeric unit 110 or on the Touch Enabled Display unit 102. Functions facilitating completion of a transaction thereafter may remain similar to what has been disclosed above.
[0023] The Smart Calculator 100 is also equipped with the QR/UPI button 206 placed on the Transaction unit 106. QR mode is one of the available modes of transaction. In a scenario, when the merchant has carried out the calculations and has arrived at the final amount on the Smart Calculator 100, the QR/UPI button 206 is pressed by the merchant, and the Processing unit 109 identifies mode of payment as through QR/UPI, and thereafter the QR module 115 is activated. When the merchant presses the QR/UPI button 206, QR module 115 of the Processing unit 109 gets activated. Thereafter, QR module 115 generates a dynamic QR code and the generated QR code will be displayed on the Touch Enabled Display unit 102. The dynamic QR Code would contain the relevant details of the merchant and possibly the amount. The display screen may also contain a ‘cancel’ and ‘check status’ button. The merchant can choose any of the options with the help of scroll buttons 230 available on the Smart Calculator 100. To scan the QR code from the mobile of the user, an application is launched on the mobile phone of the customer. The transaction details are received by scanning the QR code. Thereafter, the mobile application on the customer mobile checks various parameters for example, but not limited to the message format, payment gateway ID, etc. The user may be prompted to verify the merchant name and other parameters. Further, the mobile application connects to the payment gateway using connection information from the payment gateway profile stored in the mobile application and deliver a request message to the payment gateway. The request to the payment gateway may include the transaction details, a timestamp from the mobile application and ID of the mobile application. After complete and successful transaction, a confirmation sign will be displayed on the Touch Enabled Display unit 102 of the Calculator and the amount paid using QR mode of transaction gets stored in QR database 118. After successful transaction, there are options provided to merchant to either proceed for the next transaction or finish the transaction. The Smart Calculator 100 supports the user of popular mobile payment applications, such as WhatsApp™, Google Tez™/Google Pay™, Bharat Interface for Money™ (BHIM), PhonePe™, Paytm™, and banks’ mobile banking applications. The customer therefore has a wide choice to select any of these applications to perform the payment transaction.
[0024] In an exemplary embodiment, the Smart Calculator 100 is equipped with the Digital wallet button 210 positioned on the Transaction unit 106. The digital wallet button 210 facilitates fast, convenient, and secure digital transaction. The Digital wallet module 119 uses an interface where a user can enter information related to transaction for example, but not limited to credit card information, debit card information, contact information and shipping information. The digital wallet stores this information in wallet database 122 for subsequent online transactions. The user can use the digital wallet to complete purchases by selecting a payment option stored in wallet database 122 without the need to re-enter financial account information, contact information, or shipping information for each purchase. The user also may select a default payment option to use such that the user can confirm a purchase without making a payment option selection. An option of editing and adding more wallets to existing list of wallets makes the Smart Calculator 100 more user friendly.
[0025] In a scenario, when the merchant has carried out the calculations and has arrived at the final amount on the Smart calculator 100, and when the merchant chooses digital wallet as the option of making payment, he presses the digital wallet button 210 on the Smart Calculator 100. As the digital wallet button 210 is pressed, the Digital wallet module 119 of the Processing unit 109 gets activated. The digital wallet module 119 provides various options to the merchant on the Touch Enabled Display unit 102 of the Smart Calculator 100. The options for example, but not limited to Google pay™, paypal™, Mobiqwik™, ItzCash™, etc. The merchant can make selection from available option by scrolling up and down with the help of scroll buttons 230 available on the Smart Calculator 100. After the merchant selects his choice, the Digital wallet module 119 establishes the connection with the payment terminal with the help of Communication unit 107 in the known manner existing in the art. In case when there is inconsistency or error detected by Digital wallet module 119, the alerts are generated by the module. The alerts may be generated in case when no connection is established between Control System 101 and payment terminal. The alerts may also be generated in case of disputed transactions or rollback transactions etc. Once the transaction is completed successfully, Digital wallet module stores the amount paid in the Wallet database 122. Thereafter, merchant is provided with the option of proceeding with the payment or exiting the payment.
[0026] The Account button 212 (On Account Sales), which may be labelled as ‘Khata’ (meaning ‘on Account sale’ in the Hindi language) or anything similar, may be applied to receive and store account information of customers who prefer to make lumpsum payment for the products/services received from the merchant. Such payment may be made either in advance (e.g., according to a prepaid payment system), or pursuant to the receipt of the goods/service, for example, at the end of every month (e.g., according to a postpaid payment system). When a customer may engage the merchant in such a manner, and order goods/service from the merchant, the merchant may feed data identifying the customer (such as by the customer’s phone number), for every order placed by the customer. In a scenario, when the merchant receives the order from the customer, and when the merchant has carried out the calculations and has arrived at the final amount on the Smart Calculator 100, the merchant presses the Account button 212. As the Account button 212 is pressed, the Account module 140 gets activated. The Account module 140 provides an option to the merchant to feed an identification number corresponding to the customer via the Keypad unit. Once the identification number is fed, the Account corresponding to the customer gets registered. Optionally, the Account module 140 may further prompt the merchant to feed into the display system the name, address, and other details of the customer. Thereafter, the Account module 140 may prompt the merchant to feed in the goods/services ordered (e.g., product ID, name, etc.), the date of the order, rates applicable for the order, date/time of receipt of the order, date/time of delivery of the order, etc. Once the payment is due, for example, at the end of a month, the Communication unit 107 may deliver alerts to the customer to serve one or more reminders of a pending invoice. The alerts may include a link by which the customer may activate and navigate to a payment gateway or a payment terminal so as to make the payment. In response to the activation, the Account module 140 may establish a connection with the payment terminal with the help of Communication unit 107 to receive the payment from the customer. Once the transaction is completed, the Account module 140 stores the amount paid by the customer in the Account database 130.
[0027] The MT button 214 may be applied by the merchant to transfer money to a customer, or merchant facilitating the transfer of money from one customer to another. For example, in cases where a person would like to send money to his family located in another city, the merchant may press the MT button 214 to activate the MT module 142. The MT module 142 may prompt the merchant to enter an identification number into the Touch Enabled Display unit 102. The identification number corresponds to the customer to from whom payment needs to be transferred, and may include the customer’s phone number, for example. The Merchant may also then enter the Identification number of the recipient of the transfer and may include the customer’s phone number. The MT module 142 may direct (by assistance from the Communication unit 107) the merchant to a payment gateway, where, based on the identification number entered, the merchant may make the payment to the customer. Optionally, the merchant may add comments or reviews corresponding to the transaction for records and later analysis, if required, while making the payment. Once the transaction is completed, the MT module 142 stores the amount paid by the merchant, the date/time of payment, comments or reviews, etc., in the MT database 132. Thereafter, the merchant is provided with the option of proceeding with further payments, if need be. Alternatively, the merchant is provided with the option to exit the payment terminal.
[0028] The BP button 216 may be applied to help the merchant make ready payments of utility bills, for example, electricity bill payments, mobile bill payments, landline bill payments, etc. For this purpose, when the merchant presses the BP button 216, the BP module 144 get activated. The BP module 144 uses the communication unit 107 to direct the merchant to terminal where one or more utility bills, for which payment needs to be made, may be listed. For example, the listing may include gateway for electricity bill payments, mobile bill payments, landline bill payments, etc., as aforementioned. The merchant may select one of the options from the listing to make payment(s) corresponding to the selection. Once an option is selected, the communication unit 107 may guide the merchant to a payment terminal into which the merchant may feed (via the Touch Enabled Display unit 102) an identification number, such as a customer id, e.g., a mobile number, a landline number, etc., to correspond to the bill that is to be paid. Thereafter, the merchant may make the payment at the payment terminal. Once the transaction is completed, the BP module 144 stores the amount paid (including other details like date and time) by the customer in the BP database 134. Thereafter, the merchant is provided with the option of proceeding with further payments of other utility bills, if need be. Alternatively, the merchant is provided with the option to exit the payment terminal.
[0029] The Smart Calculator 100, of the present disclosure, is configured to provide a real time access to transaction data. A merchant can review and analyze the data for implementing future strategies related to purchase and sales of the services and the product. For example, the processing unit 109 may be configured to generate sales and revenue reports based on the stored payment transaction data within the Database System 121. Further, the generated reports may be displayed on the touch enabled display unit 102 or may be communicated to a remote display screen, such as a mobile phone or laptop or computer screen of the merchant via the communication network 300.
[0030] In one embodiment, the Smart Calculator 100 comprises a Control unit 108. The Control unit 108 is equipped with various control buttons used to control the functioning of the Smart Calculator 100. The control buttons of the Control unit 108 are placed on the left side and the right side of the Numeric unit 110 as shown in FIG. 1. The Control unit 108 includes buttons for example, but not limited to, buttons indicating configuration, right arrow button, CE, ON/C, other buttons, upward arrow button, downward arrow button, enter button etc. The right arrow button, left arrow button, upward arrow button, and downward arrow buttons (collectively, scroll buttons 230) are used to scroll through the content displayed on the Touch Enabled Display unit 102 as known in the art. The control buttons on the Control unit 108 are used to control the arithmetic and numeric calculations and functions performed using the Smart Calculator 100.
[0031] In an embodiment, the Function unit 112 includes buttons for example, but not limited to division, multiplication, subtraction, addition, percentage and equal etc. These buttons are used to perform basic calculative functions as known in the art.

INDUSTRIAL APPLICABILITY
[0032] The Smart Calculator 100 presented herein, integrates various modes of payments into a single consolidated unit, helping merchants process and track various types of financial transactions. The Smart Calculator 100 also facilitates the merchants to perform automatic financial closures and automatic bank reconciliation. Unlike other products based around a calculation device, the Smart Calculator 100 is based on a platform, such as an Android™ platform, making it easier to connect larger number of existing devices and units based on Android™ platform. The connection can be established using a SIM connection, WiFi, Bluetooth, NFC, etc. The calculator provides the function of generating proactive alerts. The alerts are generated in case when no connection is established between calculator and POS terminal. The alerts may also be generated in case of disputed transactions or rollback transactions etc. The calculator also provides deep insight in the payment history database.
[0033] Further, the Smart Calculator 100, according to the embodiments presented herein, provides a real time access to transaction data. The merchant can review and analyze the data for implementing future strategies related to purchase and sales of the services and the product. The calculator is also equipped with the option of EMI calculation. The customized buttons on the calculator for the generation of QR and acceptance of UPI makes it user friendly.
[0034] As all the transaction made via different mode of payment options gets stored in their respective databases, it becomes easy for a merchant to check his accumulated revenue at the end of the day. The revenue can also be checked separately according to mode of the transaction used, or the revenue can be checked combining all the revenue generated through various modes of payments.
[0035] The Smart Calculator 100 brings forth the capability to accept not just various forms of payment which do not involve cards, but also accepts payments which involve card based payments, thereby providing the merchant with a comprehensive and a low cost solution for facilitating varied type of transactions. This solution may be applied by businesses that have various transactional requirements, such as the need for quick calculations, printing of receipts, digital payments, taking notes, accepting payments, sending invoices, scanning barcodes, and connecting various peripheral devices, such as printers, and the like. Although aspects of the present disclosure are directed towards the payment industry, the Smart Calculator 100 can be used by merchants for various different uses – as an example, the Smart Calculator 100 may also be used for domestic and peer-to-peer transactions. The Smart Calculator 100 in itself is a tool that may be used by merchants/businesses regularly, and provides the merchant with a low cost device, useful for standing functions and allows the ability to accept various forms of virtual payments. The Smart Calculator 100 also provides the merchant an upgrade path wherein the merchant can upgrade to a more powerful and expensive devices and/or platforms, as and when the merchant wishes to do so.
[0036] While aspects of the present disclosure have been particularly shown, and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems, and methods without departing from the spirit and scope of what is disclosed. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.

ELEMENT LIST
TITLE: SMART CALCULATOR
100 Smart Calculator
101 Control System
102 Touch Enabled Display Unit
103 Input/Output Unit
104 Cast Bezel
105 Memory Unit
106 Transaction Unit
107 Communication Unit
108 Control Unit
109 Processing Unit
110 Numeric Unit
111 Cash Module
112 Function Unit
113 Card Module
114 Cash Database
115 QR Module
116 Card Database
117 Link Module
118 QR Database
119 Digital Wallet Module
120 Link Database
121 Database System
122 Wallet Database
123 POS Device
124 Merchant Database
125 Mobile Device
126 Customer Database
127 Payment Website
128 Revenue Database
130 Account database
132 MT database
134 BP database
140 account module
142 MT module
144 BP module
150 built-in NFC module
152 RFID sensor
200 Smart Calculator System
202 Cash Button
204 Card Button
206 QR/UPI Button
208 Link Button
210 Wallet Button
212 Account button
214 Money transfer (MT) button
216 Bill payment (BP) button
218 WiFi button
220 SIM button
222 Bluetooth button
224 NFC button
230 Scroll Buttons
300 Communication Network

,CLAIMS:1. A smart calculator (100) comprising:
a display unit (102) for displaying an output related to one or more payment transactions performed by the smart calculator (100);
a transaction unit (106) including a plurality of user actuatable buttons (202, 204, 206, 208, 210, 212, 214, 216) corresponding to a plurality of modes of payment transactions;
a control unit (108) including a plurality of user actuatable buttons for performing arithmetic and numeric calculations;
a processing unit (109) operatively coupled to the display unit (102), the transaction unit (106) and the control unit (108), the processing unit (109) being configured to selectively perform one or more of the payment transactions or arithmetic and numeric calculations based on a user input received via one of the transaction unit (106) or the control unit (108); and
a memory unit (103) for storing each of the performed payment transactions.

2. The smart calculator (100) as claimed in claim 1, wherein the transaction unit (106) includes one or more of a cash payment mode button (202), card payment mode button (204), QR/UPI payment mode button (206), digital wallet payment mode button (210), account/khata payment mode button (212), Money transfer mode button (214), and a bill payment mode button (216).

3. The smart calculator (100) as claimed in claim 2, wherein the processing unit (109) includes one or more of cash module (111) coupled to the cash payment mode button (202), card module (113) coupled to the card payment mode button (204), QR module (115) coupled to the QR/UPI payment mode button (206), digital wallet module (119) coupled to the digital wallet payment mode button (210), account module (140) coupled to the account payment mode button (212), MT module (142) coupled to the money transfer mode (214) and a BP module (144) coupled to the bill payment mode button (216).

4. The smart calculator (100) as claimed in claim 3, wherein the processing unit (109) is configured to activate one of the modules based on the user actuation of one of the buttons on the transaction unit (106).

5. The smart calculator (100) as claimed in claim 1 further comprising a Near Field CommunicationTM (NFC) module (150) for facilitating card payment when the user actuates a card payment mode button (204) on the transaction unit (106).

6. The smart calculator (100) as claimed in claim 1 further includes a communication unit (107) for communicating with one or more external devices connected to the smart calculator (100) via a network (300), the one or more external devices including a point of sale (POS) device, a mobile device, and a remote payment website.

7. The smart calculator (100) as claimed in claim 6, wherein the memory unit (103) is configured to communicate with a database system (121) corresponding to the one or more payment modes to store information related to each of the one or more payment modes and the payment transactions, the database system (121) including one or more of a cash database (114), card database (116), QR database (118), Wallet database (122), Account database (130), MT database (132) and BP database (134).

8. The smart calculator (100) as claimed in claim 1, wherein the processing unit (109) is further configured to generate sales and revenue report based on the stored payment transaction data.

9. The smart calculator (100) as claimed in claim 1, wherein the control unit (108) further includes a numeric unit (110) having a plurality of user actuatable number buttons for facilitating numeric input by a user and a function unit (112) having a plurality of user actuatable function buttons for facilitating arithmetic and numeric calculations.