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 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:
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