X Account
This guide explains how to create API credentials that allow developers to securely access your services via your Developer Portal.
Go to : https://developer.x.com/en/portal/dashboard
If you don't have a Twitter Developer account, you need to set one up. (Don't worry it's free - for the most basic one and it only takes a few minutes)
Go to https://developer.twitter.com and sign up for a free account using your existing X (Twitter) account.
Once on this page:
1 - select the Free plan

2 - click on Sign Up for Free Account

3 - complete the description, check the boxes, then click Submit.
For the brief description, you can add this or something similar: "Using Twitter's API, I'll schedule and publish tweets, I will leverage Twitter's API data to display tweet performance analytics, including impressions, engagement rate, link clicks, and other metrics."

You should get access to Twitter's Developer portal immediately.
On the left side menu of the Developer Portal, click the Products menu, then click the "Twitter API v2" project.

You'll see all features, the number of tweets per month, and an overview of the Free plan. You will be able to publish up to 1500 tweets per month, which covers scheduling and social inbox for most users.

Then, on the left side menu of the Developer Portal, click the Projects & Apps menu.

Click on the second project that will appear under Default project (the one that starts with your Twitter account name), on the left side menu.

Under User authentication settings, click the Set up button.

Set up your user authentication as follows:

Under Type of App choose Web App, Automated App or Bot.

https://player-service.vp-prod.com/login/oauth2/code/x-23c7427c-3065-4540-b631-9dc822b33d65

Now Save your settings

Now, on the top menu, click on Keys and tokens

On Consumer Keys (first option on the Keys and tokens screen), you will see the API Key and Secret section. This is what you need to connect your Twitter account to OnlySocial.

Click on the Regenerate button on the right side.

Confirm by clicking Yes, regenerate.

A window with your API Key and API Key Secret will open. Save these to add to OnlySocial later, then click Yes, I saved them.
💡Hint: Note them down, because they are important! Copy and paste these 2 API keys and have them saved in a document or a safe place.

Now head over to OnlySocial to setup the API keys.
Please use Download Keys and handover to us.
You can use this video as well: https://www.youtube.com/watch?v=c4VYIskH-bQ