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

Get Mondial Relay Developer Credentials

Email Mondial Relay API support and cc Tell Mondial Relay you need to obtain API credentials to access Mondial Relay API.
Mondial Relay will provide credentials for both Sandbox and Production environment:   Key and Merchant ID

Required Mondial Relay API credentials

Mondial Relay Developer Resources

Read Mondial Relay docs
Supported Mondial Relay service types and service options
Postmen Mondial Relay technical support:
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