I got an invoice to pay rent in convenience store but i am out of the country

I am in college and got my apartment last month, the first payment was through bank transfer to the agency that covered all of the fees so I assumed that's how the rest of the payments would have been done. I am back in the U.S for winter break and this is my first month paying rent, I have contacted the agency that helped me get the apartment but it's been a few hours and I haven't heard anything back. there is a phone number attached to the payment invoice but i can barely speak Japanese, if anyone has been in this situation before lmk.