WePay is required by law to verify your SSN before you can withdraw your funds. You can read more on their explanation of the matter here.
This is a federal regulation that all online payment processors must follow to comply with anti-terrorism and money-laundering laws.
Concerned about taxes? WePay will not report these donations as income to the IRS. You should work with a tax professional to ensure those donations are properly recorded. Read more here.
Even if you are making a withdrawal on behalf of an organization, WePay will need to collect both an EIN (for tax purposes) and a SSN for verification purposes.
You can rest assured knowing that your information is completely encrypted. GoFundMe and WePay uses the same secure & encrypted payments technology as your bank to ensure your information is processed safely.