"_OBJC_CLASS_$_FlutterAmazonpaymentservicesPlugin"

[fady-voo]

I migrate the package to work on flutter version before 2 which not support null safety
it works on android without any problem
in iOS it gives this error

Undefined symbols for architecture x86_64:
"OBJC_CLASS$_FlutterAmazonpaymentservicesPlugin", referenced from:
objc-class-ref in GeneratedPluginRegistrant.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)