Is the UE4 game server in the same VPC as the lambda authorization script? In that case you can use private API gateway endpoint - https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-private-apis.html
If not, then you can take a look at resource policies - https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-resource-policies.html
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