Help Debug Amazon Seller API Connection

We are having difficulties with our connectivity to Amazon APIs because of Signature v4. We keep getting a "The security token included in the request is invalid." message and we can't find the issue. We can gladly share our Coldfusion library to Sign and the credentials for testing, or we can leverage a new library as long as Signature works and the programming language is Coldfusion. Success is when we can successfully connect to any service of Seller Central APIS. We need an expert coder to help us troubleshoot or build a new signature library.