the program membership id
value of the trait
name of the trait
POST /partner-api/v2/program-memberships/{program_membership_id}/add-trait HTTP/1.1 Host: X-API-Key: YOUR_API_KEY Content-Type: application/x-www-form-urlencoded Accept: */* Content-Length: 42 "trait_value='text'&trait_name='text'"
Successful response
{ "traits": [ { "name": "text", "value": "text" } ] }