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 credentialsUnique access keys used to identify an integration in your account, linked to your application. For more information, access the link below.Credentials 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.

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 Privacy Statement and the Terms and Conditions and click Confirm.

In Your integrations you can consult the list of all your created applications and access the Application details of each one of them.

After creating your application, the test credentialsUnique access keys that we use to identify an integration in your account, linked to your application. For more information, access the link below.Credentials 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.

When accessing these credentials, the following keys will be displayed: Public KeyPublic key that is used in the frontend to access information and encrypt data. You can access it through Your integrations > Application details > Tests > Test credentials. and the test Access TokenPrivate key of the application created in Mercado Pago, which is used in the backend. You can access it through Your integrations > Application details > Tests > Test credentials..

If you are using an existing application, it will be necessary to activate the test credentials. For more information, access the Credentials documentation.

To develop your QR Code integration, use your test Access TokenPrivate key of the application created in Mercado Pago, which is used in the backend. You can access it through Your integrations > Application details > 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..

Once you have the necessary credentials, continue to create the store and cash register.