What is &quot;valid payment data&quot;? How do they validate this data?<p>You need to have a valid payment method. I&#x27;m not sure how better to explain this... a credit card or paypal account etc. It&#x27;s validated when the payment clears. Both of these have strong identity data linked to them.<p>KYC (Know your customer) &#x2F; AML (Anti Money Laundering) compliance means validating the identities of those you do business with. That means, using Steam to launder money isn&#x27;t possible. This should be pretty obvious.