Email from checkout.org?

Groovymarlin thought this was worth mentioning said
2

Hey Meh-mbers,
I keep getting this email from “checkout.org,” and it says:

It’s Checkout.org here (creators of morningsave.com, sidedeal.com, casemates.com, meh.com, and other sites). Last chance to keep your membership! We can’t process the credit card you have on file with us, ending in XXXX.

First of all, huh? I have a membership with mediocre etc. but I don’t have a membership with checkout. And my account information on Meh, including my payment method, is up to date. Is this some kind of phishing email?