Currently Sinch recommend the REST API if you are using SMS or Flash Call Verification. For more information about the Verification API view the Sinch Verification Developer Documentation.
If you are using Data Verification or Unified Verification then Sinch recommends you use the SDK. To learn more about the SDK, view the Sinch Verification SDK.
Learn how you can use the Sinch Verification APIs to secure your business and enhance relationships with your customers.