Remove `verifyPurchase:error:` indirection as it seems to have been reduced into a proxy in our implementation.
Remove `verifyPurchase:error:` indirection as it seems to have been reduced into a proxy in our implementation.

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