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First chapter was quite fun. I actually would have bought the course, but do not own a credit card. This is quite common outside of the US, if you could add PayPal it would be substantially more accessible.

Thanks! :-) That's a great point, I'll look at adding PayPal. (In the meantime, anyone in this situation: send me an email and I'll can sort something out for you! - jameshfisher@gmail.com)

When places say "credit card", they really mean credit card or debit card. Either works.

No, debit cards in most of the world do not function for remote transactions, even if they have a Mastercard or visa logo. My bank's cards for instance are Mastercard's "Maestro" product which is in-person and debit only, and has alternative infrastructure for online payments.

Which parts of the world are these? I’ve used debit cards issued by various European and US banks for online payments all over the world since the ‘90s.

What part of the world is "most of" it in this case? Where I live, Maestro and the like are considered children's cards for the reasons you mention, and real debit cards work just fine for online transactions.

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