This developer guide shows how to access OnTrac shipping API via Postmen. See also the list of required API credentials / keys for OnTrac integration.

Get OnTrac Developer Credentials

Email onTrac API support and cc with your OnTrac account number. Tell OnTrac you need to obtain API credentials to access OnTrac API.
OnTrac will provide OnTrac credentials for both Sandbox and Production environment:   Account Number and  Password

Required OnTrac API credentials

OnTrac Developer Resources

Read OnTrac API docs
Supported OnTrac service types
Postmen OnTrac technical support:
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