As an online retailer, our website has been targeted by scammers and bots. It can be difficult to detect, because the order looks legit most of the time, but I'd have to go directly into our CC processing and can see multiple attempts under the same name and up to dozens of different card numbers. This forces us as a vendor to apply stricter verifications that may trigger some card issuers own fraud filters, especially a "velocity filter". The way it works is if too many attempts back to back to back are incorrect, then it finally is input correctly, it will look like it went through but flags it for review, which normally gets auto-denied. Other times, cards used at a new to you website will trigger a fraud filter.
Not saying that political gaming isn't real, but these are some issues I see commonly.