How to pay back credit card early

Hello, I recently got a MUFG credit card and though I’m happy I got approved, they only gave me a very small 100,000 yen limit. I know that there’s a introductory 20%points bonus after I spend over 100,000 yen, but because of my limit, I won’t be able to hit it until I pay some of it off first. I want to maximize my points so I want to pay it off right away but there doesn’t seem to give me an option on the MDC app. I went thru the website FAQ and followed the instructions to go to try to pay it at the ATM, but it wouldn’t let me. I then inquired about my payable balance on the ATM and it said I had none. Am I just stuck having to wait until the end of the billing cycle for them to auto deduct from my bank account? Am I missing something? Thanks.

by SeattleBTN