Social Security Number
The information is required to confirm that there is a human entity authorized to act on behalf of the business. This prevents unauthorized people from creating an account on behalf of your business. This is also required by the processor to comply with KYC (Know Your Customer) requirements of the Patriot Act, along with complying with AML (Anti-Money Laundering) laws like a financial institution. Your full social security number will only be required if the processor is unable to verify your identity with the last four digits.
Beneficial Ownership FDIC Document