# MD for: https://www.mercadopago.com.uy/developers/pt/docs/qr-code/create-application.md

\# Create application \*\*Applications\*\* are registered entities within Mercado Pago that act as a unique identifier for managing the authentication and authorization of your integrations. In other words, they serve as the link between your development and Mercado Pago, and they constitute the first stage in carrying out the integration. With them, you can access the necessary :toolTipComponent\[credentials\]{link="/developers/en/guides/additional-content/your-integrations/credentials" linkText="Credentials" content="Unique access keys used to identify an integration in your account, linked to your application. For more information, access the link below."} to interact with our APIs or specific services, as well as manage and organize your integration, which is why you must create an application for each Mercado Pago solution you integrate. To create an \*\*application\*\*, follow the steps below. 1\. In the upper right corner of Mercado Pago Developers, click on \*\*Login\*\* and enter the required information with the data for your Mercado Pago account. 2\. Once you are logged in, in the upper right corner of Mercado Pago Developers, click on \*\*Create application\*\* if your account does not yet have any created applications, or go to "Your integrations" and select \*\*View all\*\*. There, click on \*\*Create application\*\*. 3\. Once inside \*\*Your integrations\*\*, click on the \*\*Create application\*\* button. > NOTE > > To protect your account and ensure compliance with operations, during the creation of an application, you will need to do an identity verification if you haven’t done so already, or a re-authentication if you have previously completed the verification process. !\[create-application-1\](https://www.mercadopago.com.uy/images/snippets/create-application-1-es-v1.png) 4\. Enter a \*\*name\*\* to identify your application. The limit is up to 50 alphanumeric characters. 5\. Select \*\*In-person payments\*\* as the type of payment you want to integrate, as this is the solution type corresponding to physical stores. Click \*\*Continue\*\*. 6\. Next, choose \*\*QR Code\*\* as the payment type you want to integrate and click the \*\*Continue\*\* button. 7\. Confirm the selected options. If you need to modify any selection, click the \*\*Edit\*\* button. Accept the and the \[Terms and Conditions\](https://www.mercadopago.com.uy/developers/en/docs/resources/legal/terms-and-conditions) and click \*\*Confirm\*\*. !\[Resumen de aplicación\](https://www.mercadopago.com.uy/images/snippets/create-application/ES-new-app-CODIGO-QR-v1.png) In \[Your integrations\](https://www.mercadopago.com.uy/developers/panel/app) you can consult the list of all your created applications and access the \[Integration data\](https://www.mercadopago.com.uy/developers/en/docs/qr-code/resources/application-details) of each one of them. > NOTE > > If you wish, you can edit or delete an application. In the latter case, you should keep in mind that your store will lose the ability to receive payments through the Mercado Pago integration associated with that application. For more information, consult the \[Integration data\](https://www.mercadopago.com.uy/developers/en/docs/qr-code/resources/application-details). ## Access test credentials After creating your application, the :toolTipComponent\[test credentials\]{link="/developers/es/docs/qr-code/resources/credentials" linkText="Credentials" content="Unique access keys that we use to identify an integration in your account, linked to your application. For more information, access the link below."} will be automatically generated. You should use them to perform all the necessary configurations and validations in a secure test environment. If, instead, you are using an existing application, it will be necessary to \[activate the test credentials\](https://www.mercadopago.com.uy/developers/es/docs/qr-code/resources/credentials). When accessing these credentials, the following keys will be displayed: :toolTipComponent\[Public Key\]{content="Public key that is used in the \_frontend\_ to access information and encrypt data. You can access it through \*Your integrations > Integration data > Tests > Test credentials\*."} and the test :toolTipComponent\[Access Token\]{content="Private key of the application created in Mercado Pago, which is used in the backend. You can access it through \*Your integrations > Integration data > Tests > Test credentials\*."}. !\[test credentials\](https://www.mercadopago.com.uy/images/qr-orders/credentials-test-panel-en-v1.png) If you are using an existing application, it will be necessary to activate the test credentials. For more information, access the \[Credentials\](https://www.mercadopago.com.uy/developers/en/docs/qr-code/resources/credentials) documentation. To develop your QR Code integration, use your :toolTipComponent\[test Access Token\]{content="Private key of the application created in Mercado Pago, which is used in the backend. You can access it through \*Your integrations > Integration data > Tests > Test credentials\*. During integration, use the test Access Token and, upon completion, replace it with the production Access Token if it is your own integration, or with the Access Token obtained through OAuth in the case of third-party integrations."}. > WARNING > > If you are integrating the QR Code on behalf of a third party, it is recommended to use the \*\*test Access Token\*\* throughout the entire development and testing of the integration. Before \[going to production\](https://www.mercadopago.com.uy/developers/en/docs/qr-code/go-to-production), you will need to obtain a production Access Token through the OAuth protocol (using the \[Authorization code flow\](https://www.mercadopago.com.uy/developers/es/docs/security/oauth/creation#bookmark\_authorization\_code)) and replace it. Once you have the necessary credentials, continue to \[create the store and cash register\](https://www.mercadopago.com.uy/developers/en/docs/qr-code/create-store-and-pos).