MercadoPago

Log in to your MercadoPago developer account at MercadoPago Developer Portal.
Navigate to Your Applications.
Click Create Application.
Choose a name for your application.
Under What type of payment solution will you integrate?, select Online payments.
For Are you using an e-commerce platform?, select No.
Under Which product are you integrating?, select CheckoutPro.
The Integration model field is optional, so you can leave it empty.
After successfully creating the application, go to the Production Credentials section.
Copy the Access Token and add it into the admin panel under Settings > Payments > Processors > Mercado.