I am trying to add new item and attach taxes to it.
1. `v3/merchants/mId/items`
2. and then `v3/merchants/mId/tax_rate_items` with the new item ID and tax ID.
This all work in sandbox but in production, it seems to sometimes fail to attach tax to an item even though API calls succeed without any warning or error.
There seems to be no documentation around `tax_rate_items` API, is there another more reliable way to attach taxes?