High-level flow
For a more detailed description of the protocol, check out the full
spec.
- A thread is viewed in Plain.
-
Plain fires a POST request to your API with:
- The thread customer’s email and, if set,
externalId - The configured customer card
keys
- The thread customer’s email and, if set,
- Your API responds with the JSON for each card
- Cards are shown to the user in Plain.

