You can set both Automatic Payment and Manual Payment (Use case: If you want to receive payment through a gateway that isn't listed in the Automatic Payment Gateway) gateway
Navigate to Gateway > Payment Gateway > Automatic Payment
Choose Your Payment Gateway: Decide which payment gateway you want to use (e.g., PayPal, Stripe, etc.).
Edit Credentials:
Enter the required credentials (such as API keys, secret keys, or any other necessary information provided by your payment gateway).
Save and Test: Save your changes and make sure to test the payment gateway to ensure it's working correctly.

After clicking on Edit the page will appear. Fill it out with your credentials
Navigate to Gateway > Payment Gateway > Manual Payment
Look for the "Add Method" button on your screen.
Click on it.
This action will open up the manual payment method form for you to fill out.
Fill out the form and save

If you want to edit an existing Manual Payment method, simply locate the 'edit icon' option on the list page and click on it
click on the Edit icon
Fill out the form and save