Store recipients
{ "version": "latest", "apiKey": "abcdefghijklmnopqrstuvwxyz", "content": [ { "contentType": "recipientList", "tag": "t1", "content": "+447777100100,+447777100101,+447777100102", "contentEncoding": "utf8", "options": { "expirationInDays": 0 } } ] }