The fact that RIU gets crawled by Google and RIU posts show up in search results means that you may want to take discussions of this nature to DM or find that any banks listed here may not take credit cards much longer.
Cannabis businesses of any sort in the US are considered by credit card companies (and many banks) to be "high risk" as their accounts and assets can be frozen and stolen by the feds just for sneezing in the DEA's general direction. For this reason, most seed banks are finding they have to revert back to being "cash or blank money order" only. Like
@xtsho said, the only way to accept credit right now is to have a separate, non-cannabis business that you process credit cards through (which violates your agreement with the credit card processing institution) or by using an overseas credit card processor (sketchy at best).
If you want more US seed banks to take credit cards, start putting pressure on your state's senators and representatives to completely decriminalize cannabis. No matter how many states have legalized cannabis, or that hemp farming has been legalized at the federal level, while marijuana is listed as a Schedule 1 drug, banks are going to stay far, far away from the risky side of it.