Credentials validation support

When creating a contract, HAPI Elements will be passing if_supported for credentials_validation parameter so that if the channel supports validation, the credentials are validated and the errors are clearly visible to the end user in the UI.

The type for the form used while creating the contract can be found as ContractCreateForm type

• Supported values of credentials_validation can be found as ContractCreateCredentialsValidation type and HAPI Backend Documentation

HAPI Backend, if supported by the channel and configured for the partner account, will validate the credentials

• If the channel does not support credentials validation, this parameter while creating the contract will simply be ignored, and the request will succeed even if there are invalid credentials