To sign up in PayTabs, click on the link here
Go to your store dashboard then click on Payment

Toggle on the Online Payment
Click on Settings
Click on payment providers
Choose PayTabs (If it doesn't appear at first, click on View all)
You'll find the supported countries and cards, then Integrate
These are the requirements you need to fill on your store from your account on PayTabs
Sign in to your account on PayTabs
You can find the PayTabs profile ID
You can get the keys by clicking on Developers, then Key management
Then, You will find server and client keys
Go back to your store, Activate the button, fill in the required info, then Next
Activate the buttons, then Finish