Calling Token API in Postman returning "error: invalid_client"

Calling Token API in Postman returning "error: invalid_client"

Hello,

I've been working on setting up an API to get data from zoho crm into a third-party application. I'm currently testing the setup in Postman, but I'm getting an error from the API to retrieve the access token. 

It keeps returning "error: invalid_client". I'm hard pressed on what the issue is since I copied the client ID directly from the Self Client application in the API console. 

Here's the API call:


I'm doing a post call to retrieve the access token from the API. As in the documentation I'm sending the grant_type, client_id, client_secret, redirect_uri, and code within the request body as form-data.

Does anybody know what's causing this issue?

Thank you,

Aaron.
    • Sticky Posts

    • Kaizen #226: Using ZRC in Client Script

      Hello everyone! Welcome to another week of Kaizen. In today's post, lets see what is ZRC (Zoho Request Client) and how we can use ZRC methods in Client Script to get inputs from a Salesperson and update the Lead status with a single button click. In this
    • Kaizen #222 - Client Script Support for Notes Related List

      Hello everyone! Welcome to another week of Kaizen. The final Kaizen post of the year 2025 is here! With the new Client Script support for the Notes Related List, you can validate, enrich, and manage notes across modules. In this post, we’ll explore how
    • Kaizen #217 - Actions APIs : Tasks

      Welcome to another week of Kaizen! In last week's post we discussed Email Notifications APIs which act as the link between your Workflow automations and you. We have discussed how Zylker Cloud Services uses Email Notifications API in their custom dashboard.
    • Kaizen #216 - Actions APIs : Email Notifications

      Welcome to another week of Kaizen! For the last three weeks, we have been discussing Zylker's workflows. We successfully updated a dormant workflow, built a new one from the ground up and more. But our work is not finished—these automated processes are
    • Kaizen #152 - Client Script Support for the new Canvas Record Forms

      Hello everyone! Have you ever wanted to trigger actions on click of a canvas button, icon, or text mandatory forms in Create/Edit and Clone Pages? Have you ever wanted to control how elements behave on the new Canvas Record Forms? This can be achieved