Method: POST
Url: https://api.elexlabs.com/json/api/node/sms
// HTTP Headers.
Authorization Basic SECRET_CREDENTIAL
X-CSRF-Token ACCESS_TOKEN
Content-Type application/vnd.api+json
Accept application/vnd.api+json
{ "data": { "type": "node--sms", "attributes": { "title": "SMS", "field_phone_number": "+639000000000", "field_message": "SMS message." } } }