Whistl Developer Guide & API Credentials

This developer guide shows how to access Whistl shipping API via Postmen, and Whistl web service. See also the list of required API credentials / keys for Whistl integration.

Get Whistl Developer Credentials

  1. Email Whistl sales representative and cc postmen@aftership.com Tell Whistl you need to obtain Whistl web service API credentials.  
  2. Whistl will provide testing credentials for Sandbox environment:   Client Code ,  Site Code and Customer Number
  3. Use the Whistl testing credential to generate a label via Postmen Sandbox environment. Send Whistl the sample label, together with request and response xml files.
  4. Whistl will provide the production credentials for Whistl web services API:  Client Code ,  Site Code and Customer Number

Required Whistl API credentials

Credentials Environment Description
customer_number Sandbox / Production Your Whistl customer account number. 
client_code Sandbox / Production Testing API credentials to access Whistl web service and Postmen API.
site_code Sandbox / Production Testing API credentials to access Whistl web service and Postmen API.

Whistl Developer Resources

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