The transaction was definitely declined but it seems unlikely that this was solely due to the username containing the sub-string "iran". The Bandcamp support en

The transaction was definitely declined but it seems unlikely that this was solely due to the username containing the sub-string "iran". The Bandcamp support engineer only speculated that this could be the cause. The user reports that they are able to use the Paypal account normally and they only get this error when attempting to pay Bandcamp however this may just be some special rules that Paypal implements when making payments to US companies from foreign accounts (it appears this user is in Uruguay).