Accounts and Products

Accounts and Products

Hi ZOHO team.
We are using Accounts\products association  , and we need to perform back-office tasks , when a new association is created ( in simple words ,  additional Product is being added to an Account)
I didn't find any way to create a webhook based on that  , and I see , that doing API calls or custom function ( fetch all products or and accounts and finding deltas on the product association  ) is very expensive.
Can you please suggest a better way of doing this check ? 
thanks in advance .