# ISO 20022 Messages

{% hint style="info" %}
ISO 20022 messages are submitted to Nexus via asynchronous API.

The ISO 20022 XML message itself will be included in full in the message body.

The Source IPSO will also define an endpoint to which Nexus should send the resulting response (ie when submitting acmt.023, the Source IPSO must also define the acmt024Endpoint to which Nexus should send the acmt.024 response).
{% endhint %}

{% openapi src="/files/DOjiTilfU7PfNKo6SDru" path="/iso20022/acmt023" method="post" %}
[2025-04-07-Nexus-OpenAPISpec-APIS-READY-FOR-RELEASE copy.yaml](https://260996932-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FdlTzGEXDmi664xppppmm%2Fuploads%2Fgit-blob-4cbd9d58f76104a76563734b255ecb6b9d27f5cc%2F2025-04-07-Nexus-OpenAPISpec-APIS-READY-FOR-RELEASE%20copy.yaml?alt=media)
{% endopenapi %}

{% openapi src="/files/DOjiTilfU7PfNKo6SDru" path="/iso20022/pacs008" method="post" %}
[2025-04-07-Nexus-OpenAPISpec-APIS-READY-FOR-RELEASE copy.yaml](https://260996932-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FdlTzGEXDmi664xppppmm%2Fuploads%2Fgit-blob-4cbd9d58f76104a76563734b255ecb6b9d27f5cc%2F2025-04-07-Nexus-OpenAPISpec-APIS-READY-FOR-RELEASE%20copy.yaml?alt=media)
{% endopenapi %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.nexusglobalpayments.org/apis/iso-20022-messages.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.