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Question

Fulfillment shipment webhook header issue

  • Aug 17, 2026 5:33 AM UTC
  • 3 replies
  • 12 views
asha_teqtivity

Thanks in advance!

I have configured a custom header (X-Webhook-Secret) on FULFILLMENT_SHIPPED_V2 webhook, and while the header is saved correctly (visible when listing webhooks via the API), it is not being included in the actual POST request sent to our endpoint when the webhook event fires.
I have confirmed that the same custom header setup works correctly for LABEL_CREATED_V2 and SHIPMENT_CREATED_V2, which indicates this is specific to the FULFILLMENT_SHIPPED_V2 webhook dispatcher.

 

Attached a request file for the reference

 

3 replies

  • JuanAdmin
  • Community Manager
  • Aug 18, 2026 3:25 PM UTC

Hey there, 

Have you reached out to our API team or support team? 

If not, please open a direct support ticket from within your ShipStation account and include:

  1. The Webhook ID for your FULFILLMENT_SHIPPED_V2 hook.

  2. The request file you attached here.

  3. Written permission for our API Support team to create a temporary test webhook and a test order in your account so they can reproduce and trace the header drop.

I am also flagging this thread internally with our developer relations team so they are aware this. 

Thank you for bringing this to our attention with such clear documentation!

asha_teqtivity

Hi Juan,

I reached out the support team and their response is the following:

 

So, can I have an ETA for this?

Request #10049745 

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    • JuanAdmin
    • Community Manager
    • Aug 19, 2026 7:25 PM UTC

    They will be reaching out to you soon. The API team is usually very responsive. Thank you for sharing. 

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