Duplicate fulfillment

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Hi all,


We have a shopify site that uses a private app developed by us which performs fulfillment,tracking and returns rates from SmartFreight.


How it works with regards to the fulfillment is that it runs on the webhook "Order Fulfilled", and calls a php file which performs the request to smartfreight and returns the tracking info to shopify.

The only issue is that it duplicates this import into smartfreight and I have verified that both the code and the API are working correctly, as we use this code on other sites and it works.


Can anyone assist? I will be most appreciative.