Integration With Mondial Relay
Last Updated: May 3, 2026
ReturnGO integrates with Mondial Relay to help you manage your return shipping in Europe. Mondial Relay is a leading eCommerce distribution company in France and Europe, offering an extensive range of shipping carriers.
For the best experience, it’s recommended to use Ship by ReturnGO, ReturnGO’s built-in shipping solution. Ship by ReturnGO is available on all plans and needs no integration.
Capabilities
The ReturnGO-Mondial Relay integration supports:
- Domestic pay-on-scan return labels
- Live return tracking updates
- QR codes
| Return Labels | Return Tracking | QR Codes | Auto Select Cheapest | International Shipping |
See a full feature comparison with other shipping carriers.
Requirements
To integrate your Mondial Relay account into ReturnGO you will need the following:
- A Premium plan or higher
- Dual Carrier API Username (your Mondial Relay account email)
- Dual Carrier API Password
- Dual Carrier Customer ID
- WebService API Brand ID
- WebService API Private Key
Linking Your Mondial Relay Account to ReturnGO
To link your Mondial Relay account to ReturnGO:
- Go to Settings > Integrations.
- Click on ADD PRODUCT OR SERVICE.
- Choose Mondial Relay from the drop-down list.
- Click on the green check mark.

- Enter your credentials.
- Click CONNECT.

Adding the Integration to a Return Method
Once you've connected the integration, you'll need to add it to a return method:
- Go to Settings > Return Methods.
- Open the Ship with pre-paid label section.
- Click ADD RETURN METHOD or select a return method to edit.

- Open the Shipping Label Settings section.
- Set Connection to Mondial Relay.
- Select a carrier/service level.

- Verify your return address and shipping instructions.
- Click on the save icon to save your changes.

Troubleshooting the Integration
Many of the issues encountered related to integration can be identified during setup or label generation.
Here are a few things you can check to try and fix such issues:
Setup Issues
Make sure your API credentials are accurate.
- There should be no extra spaces before or after each API entry.
- Make sure you are using live or production API credentials, and not dev or test APIs.
- Try to re-generate a new API key and reconnect.
- If a carrier or service level is not available, contact your shipping service support team to verify which return services are available.
Note: Some carriers support forward deliveries only, returns only, or both.
Label Creation Issues
Verify your Return Address.
- Some carriers require that the return address be registered or linked to your carrier account.
- If the address is not associated with your shipping account, the label may fail to generate and display an error such as No shipping locations found.
- Some carriers may not recognize special characters, which might cause issues when generating labels.
- Remove special characters and unnecessary spaces in your return address.
- For example:
- If your store name is “John & Jane Store”, change it to “John and Jane Store”.
- If your store phone number has “+” signs or “( )”, remove them.
Verify the Customer’s Address.
-
ReturnGO collects the order's shipping address when the request is submitted.
- If there are corrections to the customer’s address, reject and resubmit the return request.
Verify the Item Weight.
- If the total weight of the items being returned exceeds the service level’s weight limit, then the carrier will reject the label request.
Verify if you can Generate a Return Label for the Order Directly in the Shipping Platform.
- If your shipping service platform cannot generate the label, then it will also fail in ReturnGO.
Mondial Relay-Related Issues
For Mondial Relay-related issues, please contact Mondial Relay support.
For any other issues, feel free to contact ReturnGO support through chat or email.