2.3.5.1.Variant
Variant stock call operation is PUT and will update the stock of the specific product.
TEST - https://testapi.fastcheckout.com/api/stock/variant
LIVE - https://liveapi.fastcheckout.com/api/stock/variant
JSON Structure
{ //required valid int even if send as string "product_id": "2", //required valid int even if send as string "stock": "10", }