Coinos has a simple REST API that can be used to register accounts and make payments and queries.
This token authorizes you to use the API as {user.username}
Register a new user account with a username and password
Login to an account to get its auth token
Create an invoice.
Sample response
You can check the received field to see how many satoshis have been paid so far
Fetch an invoice by passing a bitcoin address or lightning payment hash
Get all payments sent or received by the current user
Subscribe to real time rates and payments