Automate MercadoPago payment

[hectoritr]

Is your feature request related to a problem? Please describe.
Yes, many users subscribe to the app and don't see the effects instantaneously, this should be automatic.

Describe the solution you'd like
I would like an integration with the payment provider to unlock the premium version automatically.

Action Plan

• Design the strategy using Mercapago API and Cloud Functions
• Implement Cloud Function
• Test

[gonojuarez]

Mercado Pago Android Api
Mercado Pago ios Api
Mercado Pago Github
Mercado Pago Dart Example