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In either of the two approaches, if an API Gateway receives an invalid token, it returns an error to the requesting client saying that the token is invalid. The <APIGateway> element of the <PRODUCT_HOME>/repository/conf/api-manager.xml file contains details of how to configure the API Publisher to publish APIs to different Gateways. Visit this section of the API Manager documentation to see details of the <APIGateway> configuration and a sample configuration of an API Publisher which has 3 Gateways configuredFor details, see Configuring <APIGateway> in api-manager.xml file.