Another option to donate for those with PayPal account is to directly login to PayPal site instead of using the GoGetFunding payment page. Donations will still reflect in the #SunPowerHelps campaign site.

For donations not through PayPal (i.e. thru debit/credit card) It might also be helpful to clear all cookies in your computer/gadget browsers (Chrome or Internet Explorer) to make sure that history of your previous log-ins to PayPal account or other credit cards are removed. This sometimes affects the validation process. It is also advisable to use credit cards not associated or linked to PayPal.