The API Gateway has a default mediation flow, which you can extend by adding custom mediation sequences. You create a custom mediation sequences either sequence either manually or using WSO2 tooling support (i.e., WSO2 Developer Studio), and then engage it per API or globally to all APIs of a specific tenant.
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Please note that following mediators are not usable within custom sequences since they are not supported by API Gateway custom medications.
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Creating per-API extensions
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You can also engage mediation extension sequences to all APIs in the API Manager all APIs of a specific tenant at once. To do that, simply create the XML with the naming pattern WSO2AM--Ext--<DIRECTION> and save it in the <APIM_HOME>/repository/deployment/server/synapse-configs/default/sequences directory.