I want to pay my full balance early, is this possible?

It absolutely is possible!

You will need to move all your planned transactions back to in full (1 month) in the app so that when you do make a final payment, it will be taken in full.

This will remove of all of the instalment plans you have existing, so we will show you a final payment due rather than the cost spread across future instalment plans. This will also remove any future interest from your account.

Can't replan? Check this article.