We would like to have a new API for coupons , this API would need to deduct or increase a coupon from the coupon count in the system. The reason we need this is to control the coupon usage from salesforce.   I know there is an existing api to read the coupons , we just need a write or update api 

This is the read coupon,

GET

https://example.thoughtindustries.com/incoming/v2/coupons