Prerequisites - Salesforce Commerce Cloud - Mercado Pago Developers
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Previous requirements

To integrate Mercado Pago into Salesforce Commerce Cloud, you must meet the requirements listed below.

Mercado Pago or Mercado Libre seller accountTo integrate the Mercado Pago cartridge in your Salesforce Commerce Cloud store, you need a seller account in Mercado Pago or Mercado Libre. If you don't have it yet, click here to create it.
CredentialsThey are unique passwords with which we identify an integration in your account. To carry out the integrations, the Public key and the Access token will be required. click here for more information.
Salesforce Commerce CloudYou must have a store created in Salesforce Commerce Cloud. This cartridge is available as of version 22.8 of Commerce Cloud. For more information about Salesforce Commerce Cloud, go to official site
ApplicationApplications are the different integrations in one or more stores. You can create an application for each solution you implement to keep everything organized and on track for easier management. Check Dashboard for more information on how to create an application.

If all prerequisites have been met, you will be able to complete the subscription.