provider property
Provider pins a provider service name (twilio, plivo, twilio_email, mail). Empty picks the one whose org credentials are actually configured in KMS.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? provider;