Facebook recurring notifications

[ericnewcomer]

Facebook recently opened up their recurring notifications API. This is a way to get ongoing opt-in at regular intervals to allow outbound messages to be sent. This likely represents a replacement of the tag attribute / notification type.

This likely necessitates formalizing the concept of opt-in at the platform level with a way to configure opt-in requests and channels with a way to utilize it. Or maybe this all belongs at the Facebook channel level and the configuration exists therein. In any case, general flow is:

To send daily, you need to get weekly opt-in.
To send weekly, you need monthly opt-in.
To send monthly, you need yearly opt-in.

More here:
https://developers.facebook.com/products/messenger/recurring-notifications/

Additionally, the WhatsApp 24 hour messaging window requiring a template might fit into this recurring opt-in model.

The challenge here is how / where to abstract this functionality.

Additionally, this is likely a critical piece for U-Report going forward.

from: rapidpro/rapidpro#1673