the program membership id
used to prevent double-processing
POST /partner-api/v2/program-memberships/{program_membership_id}/activities HTTP/1.1 Host: X-API-Key: YOUR_API_KEY Content-Type: application/x-www-form-urlencoded Accept: */* Content-Length: 149 "activity[transaction_timestamp]=1&activity[value]='text'&activity[activity_type_id]='text'&idempotency_key='text'&activity[line_items]=[]"
Activity recorded for post-processing
{ "idempotency_key": "text" }