NYr - Please correct me if I am wrong. When I was first on this site I too was worried about using a RL credit card. Not because of the SO because she never sees the bills or statements. I was concerned about a hack like the one at Ashley Madison where members were exposed.
I was told that eccie uses CCbill and therefore payment is not directly tied to this site. If someone hacks CCbill there is no way to know exactly what you paid for. I hope this is the case. I would feel bad if my parishioners knew about this.