Find minimum requirements and information about ProGuard and encryption export regulations.
Android SDK version 21 is the minimum version required for using the Sinch Verification SDK.
There is no need to add any specific ProGuard rules connected with Verification library as each module contains specific consumer-rules.pro file that will be automatically consumed by the the client application.
Please check the Summary of U.S. Export Controls Applicable to Commercial Encryption Products and ensure that the application is registered for the Encryption Regulations, if applicable. It can be found under this link.