Integration with InPost UK

ReturnGO integrates with InPost UK to help you streamline your return shipping process by offering locker returns.

InPost UK is a leading automated parcel machine (APM) service provider that is reshaping the cost efficiency, convenience, and sustainability of eCommerce deliveries.


The ReturnGO-InPost UK integration supports:

  • QR code return labels
  • Return tracking updates
Return Labels Return Tracking QR Codes Auto Select Cheapest International Shipping

See a full feature comparison with other shipping carriers.

How it Works

Returning items with InPost UK involves the following steps: 

  1. When the RMA is approved, the customer gets a QR code (with a PIN number in case the QR code doesn’t work).
  2. The customer goes to a locker, scans the QR code, and places the return package in the locker.
  3. Once the package is dropped off in the locker, the RMA is marked In Transit.
  4. All return packages go to a centralized hub for consolidation and inspection.
  5. From the hub, the items are sent to your warehouse.


Each locker compartment can hold a maximum weight of 15kg.

There are 3 sizes of InPost locker compartments:

  • Small (8cm x 38cm x 64cm)
  • Medium (19cm x 38cm x 64cm)
  • Large (41cm x 38cm x 64cm)


Note: This integration is currently in Beta and not yet fully available to all merchants. Contact us for more information.

To connect your InPost UK account to ReturnGO, you will need your:

  • InPost UK client ID
  • InPost UK API key

Linking Your InPost UK Account to ReturnGO 

To link your InPost UK account to ReturnGO:

  1. Go to Integration > Products & Services
  3. Choose InPost UK from the drop-down list. 
  4. Click on the green check mark

5. Enter your credentials. 
6. 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:

  1. Go to Return Methods
  3. Click ADD RETURN METHOD or select a return method to edit.

4. Go to the Shipping Label Settings section. 
5. Set Connection to InPost UK
6. Select a carrier/service level.

7. Verify your return address and shipping instructions. 
8. Click on the save icon. 

Return method settings-png-1

Authorizing InPost UK Labels

InPost requires each new integration to create a test label for authorization. To do so, create a test order and send the label generated to with the following subject line:
“{your_inpost_client id} - ReturnGO integration test label”.

Please allow 1-2 business days to get a reply from InPost UK.

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. 

Label Creation Issues 

Verify your Return Address

  • 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 customer’s 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 That the Shipping Platform Can Generate Return Labels

  • If your shipping service platform cannot generate the label, label generation will be unsuccessful in ReturnGO as well. 

InPost UK-Related Issues 

For InPost UK-related issues, please contact InPost UK support.

For any other issues, feel free to contact ReturnGO support through chat or email.