Token refreshing and validation

Features implemented

• OAuth2Service.RefreshTokenAsync method.
• OAuth2Service.ValidateTokenAsync method.

Initial Release

Features implemented

• Authorizaton token retrieval
• Document upload
• Document delete
• Create signing link (to the document that requires an e-signature)
• SignNowException implements AggregateException. If SignNow returns several errors in response, SignNowException contains all the errors as child exceptions.
• SignNowException.Data contains the integer value of a response status code instead of a string one.
• Implemented document ID parameter value validation in DocumentService.DeleteDocumentAsync method.