Create a payment for externally-managed purchase [Beta]

Use this endpoint: POST /3.1/payments to create a payment for an externally-managed purchase (EMP). Externally-managed purchases are purchases of offers whose lifecycle is NOT under control of Cleeng.

Please note that the # sign at the end is NOT part of the endpoint - it is only used for documentation purposes to differentiate documentation for creating payments for externally-managed purchases (here) from documentation for creating payments for Cleeng-managed purchases.