How POST request from client-side directly

[baxing]

Hello,

I want to POST Request directly from the Browser side, which must not go through the Server side as shown in the picture.(This is a payment gateway requirement.)


Currently, I am using REST Client to manage requests, but the results show that Gateway cannot verify it because the request is sent from my server.

Please advise me which command to use to send the POST Request so that the command is sent/received directly from the Client side only.

Thank you