The way my Costa Rican issued Visa and MasterCard work is that by default the banks here issue national cards which can't be used overseas but on request they will switch them over to international cards which work worldwide.
Also, I use a US-based mail/package forwarding service with a Miami street address and PO Box and my Cost Rican banks have added those addresses as additional billing addresses to my cards. Although I generally purchase from Amazon and B&N using my US bank card, I've made purchases from both (and from other sellers in the US) using my Costa Rican bank cards and have never had a problem except that sometimes, due to my overseas IP address, I'm required to verify the cards to avoid potentially fraudulent use.
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