Using WePay does not necessarily affect your taxes. WePay helps you organize your payments and under certain circumstances will issue you Form 1099-K, a requirement from the IRS. Your SSN and Tax ID will only be reported to the IRS in the event that you collect more than $20,000 and 200 payments in the calendar year. More information can be found here.
Note: WePay is currently only available to makers in the U.S.