Are you able to provide a screenshot of the error you’re seeing? It looks like you may be in a development store and in that case, you need to make sure you are applying your test orders with a Bogus Test gateway or by enabling “test mode” with your payment gateway.
Hello Ren, how are you? i’m trying apply discount on my gateway its a payment app, i already did this apply discount in other development store, but in another partner with success, but this no success in this store/partner.
Thanks for clarifying where the error is occurring. As this falls outside of my particular scope, I would recommend posting in our Technical QA forums to reach fellow developers.
It may be worth reaching out to your partner in your previous development store where you found success with this as they could shed some light on the issue too. Best of luck!