Need some help about [store pick up]

[chokc]

Dears,

I want to enable the [Store pick up] service.

Because my store needs to use a third-party OMS to handle this type of order, so I need to integrate my OMS with the Shopify.

In my vision: when the store prepares the goods, the store staff will operate on the OMS, and then the OMS will  call Shopify API to identify the order as [Ready for pick up] status.

When I looked for [Ready for pick up] on the Shopify API document, it was not successful.

Hope the Shopify experts will give me directions.

Thanks.