Coupon API not working for guest user

[gnanasekaranl]

Followed below steps,

1. Create cart for guest user URL: http://devsite.com/magento2.2/rest/all/V1/guest-carts

   Content-Type: application/json
   Method: POST
   Authorization Bearer Key: yfna0bkjnj3j8jcr42rk7a1f3391yy0c

   Request Parameters: NIL

   Response :
   adf748e2e78b4cd4d7d3795a127bed97 (Generates Cart ID in response)
   create coupon in backend and also by API
   Apply this coupon to cartId
   URL: http://devsite.com/magento2.2/rest/all/V1/guest-carts/adf748e2e78b4cd4d7d3795a127bed97/coupons/782OYX2VOEINUF08

   Content-Type: application/json
   Method: PUT
   Authorization Bearer Key: yfna0bkjnj3j8jcr42rk7a1f3391yy0c

   Request Parameters: NIL

   Response :
   {
   "message": "Coupon code is not valid"
   }
   For check I have applied this coupon in front-end of website as a guest user its work. In API only its not working

[magento-engcom-team]

@gnanasekaranl, thank you for your report.
We've acknowledged the issue and added to our backlog.

Coupon code also does not work for logged-in customer through webapi, on frontend it works fine.

magento-engcom-team any updates?

[mgarciaebo]

I'm working on this #distributed-cd

[matkeupon]

So many critical erros on this thing...
How many years until this will strat to become useable ??

[mgarciaebo]

@matkeupon I have already found the problem and a possible solution. I will send a fix to the dev team (I'm an external contributor), so keep in touch because this could be solved soon. Regards!