I found this out when I lived in the USA for a few years back in the 90s, owning an aussie credit card. Reason many business's in the states can't accept overseas cc's, is the post code (or zip code as they call it). Their system, takes 5 digits (not 4 like ours) and is required for processing approval. The not-so-obvious way to get around this - get an american express cc if you're dealing with american companies who can't get around this problem. Having said that companies such as OPT are excellent to deal with and accept all types of payment these days, so the system is improving.
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