Sry for spamming here. I wanted to ask does Jashinn have a patreon or something similar? I tried becoming a member through Fantia and Ci-en but there is no Mastercard or Visa option for the credit card or at least I haven't found any. Also a lot of it is in Japanese so it's really hard to navigate the websites.
Viewing post in Syahata's bad day(v1.0.5) comments
You can use your credit card at Ci-en ヾ(ヾ(•ω•`)o
First you can go to the page to buy points:
https://www.dlsite.com/maniax/mypage/user/buy/point
Then select For Books (you will need to sign up for a For Books account).
Then select "More payment options" and use Card.