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title: "Use Case 4: Non-Organization-Owned API Exposed to a Non-Organization-Owned API Consumer"
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# Use Case 4: Non-Organization-Owned API Exposed to a Non-Organization-Owned API Consumer

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

Use case four has one pattern that supports the scenario in which a non-organization API is exposed
to a non-organization API consumer.

## Pattern 9: Non-Organization External API exposed to a Non-Organization External Consumer

In pattern nine, Flex Gateway acts as an intermediary between two external entities; for example,
when an external customer consumes a travel information service offered by an external airline.

![Flex Gateway acts as an intermediary between an external application and external API](/mulesoft/current/en-us/gateway/1.9/_images/ad-uc-1-p-4.png)

The following diagram shows the physical implementation of a scenario in which a non-organization
external API is exposed to a non-organization external consumer on Kubernetes. The diagram assumes
that the firewall terminates the incoming external mTLS connection.

![A detailed view of pattern nine, which contains the necessary services to support Flex Gateway](/mulesoft/current/en-us/gateway/1.9/_images/ad-uc-4-p-9-physical.png)

## See Also

- [Use Case 1: Organization-Owned API Exposed to an Organization-Owned API Consumer](https://docs.mulesoft.com/gateway/1.9/flex-architecture-uc1)

- [Use Case 2: Organization-Owned API Exposed to a Non-Organization-Owned API Consumer](https://docs.mulesoft.com/gateway/1.9/flex-architecture-uc2)

- [Use Case 3: Non-Organization-Owned API Exposed to an Organization-Owned API Consumer](https://docs.mulesoft.com/gateway/1.9/flex-architecture-uc3)