Tutorials: https://developers.sap.com/tutorials/implement-subscription-callback-multitenant.html
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The example will fail due to default RBAC setting in the Kyma environment. Creating ApiRules in a given Kyma environment with the K8s configuration retrieved by KubeConfig.loadFromCluster() leads to executions of all subsequent API calls using the Service Account 'default' which does not possess the required authorizations for the API group gateway.kyma-project.io.