Though I have provided permissions of "read_inventory" then on still calling this query getting this error{ products(first: 5) { edges { node { id legacyResourceId hasOutOfStockVariants handle ...

Really really appreciate this help. Yup i grabbed customer.id in my callback.. Thanks a lot bro.  

Hello Karl, Agree with you, but I was considering the case if user is logged in already and in this case user_id must be returned.  If above is not valid, then how i can get user_id in checkout_creation webhook callback?  

Hello Busfox, in this concern my user_id is null in cart creation/updation webhook. Please help I need to get back user/customer_id