Assign a phone number to the authenticated app
App API key (format: sk_live_app_* or sk_test_app_*) for app-level operations
Phone number added successfully
Unique identifier for a Phone Number. Format: ph_[test_]{ksuid}
"ph_2DbBs7GWhGvVNJGrDXr5RG0mBWI"
Unique identifier for a App. Format: app_[test_]{ksuid}
"app_2DbBs7GWhGvVNJGrDXr5RG0mBWI"