thanks for reaching out to the Spotify Community !
You can visit this info page to view all the optional payment method available in your country.
However, if bank transfer isn't an payment available option I do recommend you visit the "Ideas" section of the community and post your idea there.
You can follow the instructions written here to post your idea correctly and read all about how this feedback reaches the right Spotify factors here.
Hope this sheds some light 🙂