Extends `verifyPurchase:` with error parameter (`verifyPurchase:error:`). Elevate the errors during parsing plist data upwards.
Extends `verifyPurchase:` with error parameter (`verifyPurchase:error:`). Elevate the errors during parsing plist data upwards.

dxd214/CargoBay,songsinh88/CargoBay,LiuDeng/CargoBay,hanhailong/CargoBay,vvw/CargoBay,ycaihua/CargoBay,mattt/CargoBay