You are passing an incorrect URI. It should be like: http://api.aspose.com/v1.1/barcode/recognize?type=PDF417&url=http://upload.wikimedia.org/wikipedia/commons/0/07/Better_Sample_PDF417.png&appSID=xxx&signature=yyy
The sign method does not return appKey parameter in the URI. We have tested against the Aspose cloud service and able to read Pdf417 code correctly. Please refer to the help topic there:
Please feel free to reply us in case of any confusion or questions.
Second approach is REST example, The complete sample code in various languages is available on the help topic.
Based on query of signature parameter, all requests should be signed. To sign a URI, you need to pass two extra parameters (appSID and signature). appSID is your AppSID you get after signing up at https://aspose.cloud/ and signature is base64 encoded AppKey. You can notice Sign method in our sample codes. It’s to sign request URIs. We’re not familiar with FileMaker Pro. We’re here to provide technical support of Aspose APIs.
Please refer to the Sign method code there:
We hope, this helps. Please feel free to reply us in case of any confusion or questions.