https://docs.mulesoft.com/policies/policies-custom-overview

https://docs.mulesoft.com/policies/policies-custom-offline-apply

https://docs.mulesoft.com/policies/policies-custom-mule-4-reference#understanding-execution-order

https://github.com/mulesoft-catalyst/canary-policy-mule-4

https://github.com/mulesoft-consulting/circuit-breaker-policy-mule4

https://github.com/mulesoft-catalyst/exponential-backoff-retry-policy-mule-4

https://github.com/mulesoft-catalyst/correlation-id-enforcement-policy

https://github.com/mulesoft-consulting/saml-accesstoken-exchange-policy

https://github.com/mulesoft-consulting/kerberos-auth-custom-policy

https://github.com/mulesoft-consulting/mule4-masking-policy

https://github.com/djuang1/flex_gateway_custom_policy_example

https://mulesoft-labs.dev/codelabs/publish-flex-gateway-policy-to-exchange/index.html#0

https://github.com/mulesoft-catalyst/flex-gateway-dev-framework

Flex Gateway Custom Policy Development Kit