Synchronize Shop Inventory (fetch_stock) not updating inventory level

[charlie-smr]

Store: https://bayer-online.myshopify.com/

Hi, we have integrated with the REST FulfillmentService /fetch_stock API however it is not working as expected.

We can see in our server logs that Shopify is requesting the stocklevel every hour, and a well formed response is returned on average within 200ms.

See this SKU for example: gICAuMz3ihaAgICs88C3FICAgNzC_qsU is returned with stocklevel 0, but stocklevel is not changed in shopify. gICAuMz3ihaAgIDcr-uGFICAgNybuLkW is returned with stocklevel 2, again no change in shopify.

Endpoint that shopify is requesting: https://api.sorthub.com/wh/SHxDOKL8twDAThYsT-C-S2OFlkYXjdPBAzgPCpRLP-pS/FgsI-sT_MJKgrUaT4NxeJSTPgk5r...

Response (shortened):
{
...
"gICAuMz3ihaAgIDcr-uGFICAgNybuLkW": 2,
"gICAuMz3ihaAgICs88C3FICAgNzC_qsU": 0,
...
}