问题
Undefined symbols for architecture arm64:
"_PKPaymentNetworkChinaUnionPay", referenced from:
-[UPAInitViewController startAPPay] in libUPAPayPlugin.a(UPAInitViewController.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
解决方法
xcode升级到7.2，iOS9.2
