Pass the API key in the Authorization header, You need to put Token keyword before the API key. e.g. 'Authorization: Token
The type of phone number to add, TWILIO in this case.
TWILIO The phone number to add to the Twilio numbers of a user.
1A label to identify the phone number.
1The Twilio Account SID associated with the Twilio number.
1The Twilio Auth Token for authenticating API requests.
1