Why fulfillment service callback url could not receive message?

[voidarea]

Our app To become a fulfillment service app, refer to the development documentation https://shopify.dev/apps/fulfillment/fulfillment-service-apps , we called the interface https://shopify.dev/api/admin-graphql/2022-07/mutations/fulfillmentservicecreate , finished creating.
----------------------------------------
[ { "name": "SmDroping", "callback_url": "https://paypaltest.wiioreg.com/", "format": null, "handle": "smdroping", "inventory_management": false, "location_id": 69917278447, "provider_id": null, "requires_shipping_method": null, "tracking_support": true, "email": null, "include_pending_stock": false, "service_name": "SmDroping", "id": 59801534703, "admin_graphql_api_id": "gid://shopify/ApiFulfillmentService/59801534703" } ]
----------------------------------------
Question: when the store requests fulfillment, our callback_ URL did not receive the message. Where can I check the relevant logs, like webhook

[voidarea]

I tried the callback_url:

https://xxx.com/

https://xxx.com/fulfillment_order_notification

[Jastrup]

Hi Voidarea, 
I also have the same issue, I am not getting any message to my callback_URL have you been able to find a solution to this? pls share

[voidarea]

I solved this problem，You need to set fullmentordersoptin=true

[gnusmusigor]

hm, probably any other actions are needed as well? cos I have "fulfillment_orders_opt_in": true and  I am not getting any message to my callback_URL when fulfill order items.

[voidarea]

You need to make sure that your real callback address is：

https://a34a-46-211-153-67.ngrok.io/payment/fulfillment_order_notification

[gnusmusigor]

sure, I checked it and the POST route exists

[SaadMayo]

hi Voidarea !
I already set fulfillment orders opt_in = true, and still not working

[SaadMayo]

any good luck Voidarea. am facing the same issues