sms_sender_name_invalid
HTTP 400invalid_request
sms_sender_name must be 3–11 letters (a–z, A–Z) or digits with at least one letter: no spaces, hyphens or Icelandic letters.
Handling it
Fix the request and send it again. message says what is wrong, and param names the parameter where there is one. Keep the request_id: it lets Parasend find the request.