Anti-Money Laundering (AML)
The laws, checks, and monitoring designed to stop illicit funds from moving through the payment system.
Anti-money laundering, usually shortened to AML, is the set of controls that stop payment systems being used to disguise the origin of criminal funds. For a merchant it shows up as the checks your acquirer runs before and during your account life.
The obligation sits with the bank, which is why it lands on you as documentation. Sponsor banks are legally required to know who they are doing business with, so they verify the legal entity, identify the individuals who ultimately own or control it, and satisfy themselves your stated business model matches the transactions actually flowing through the account.
That last test is the one merchants underestimate. AML monitoring is behavioural, not just documentary. Volumes far above what you projected, a sudden change in average ticket, payments from geographies unrelated to your stated market, or structuring that looks designed to stay under a threshold will all trigger review even when your paperwork was faultless at onboarding.
The practical protection is to keep your file current. Tell your provider before volumes step up, before you enter a new market, and before you add a product line. An expected change is a note on the file; the same change unannounced is an alert.