Board Thread:Questions and Answers/@comment-31118942-20170507222548/@comment-25615967-20170508050602

As CDRW said, don't use a proxy when adding your card

Now if the normal DMM rejects your card then try adding your card on the R18 version of DMM(this version accepts a larger number of cards) then log back to the regular version and buy the points there

If the R18 rejects your card too the only other options are:

Paypal(which you can't use), Bitcoin, Bitcash, via a bank transfer(I think this requires a japanese cellphone number) or using a dmm points card which I think is only available on japan