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

Email Whistl sales representative and cc support@postmen.com Tell Whistl you need to obtain Whistl web service API credentials.
Whistl will provide testing credentials for Sandbox environment:   Client CodeSite Code and Customer Number
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.
Whistl will provide the production credentials for Whistl web services API:  Client CodeSite Code and Customer Number

Required Whistl API credentials


Whistl Developer Resources

Read Whistl API docs
Supported Whistl service types
Postmen Whistl technical support: support@postmen.com
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