> For the complete documentation index, see [llms.txt](https://developer.esw.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.esw.com/package-api/resources/copy-of-additional-information.md).

# Copy of Additional Information

{% tabs fullWidth="true" %}
{% tab title="Package API v4.0" %}
The following additional information applies when using the Package API v4.0:

* You can send a maximum of 300 packages in a single payload.
* The shipping label is returned as a base64-encoded string in ZPL or PDF format.
* Commercial invoices, sales invoices, and return labels are returned as base64-encoded strings that must be decoded to view as PDF.
* If the system is unable to generate the shipping or returns documentation due to any reason, the value of the `documentStatusparameter` is returned as an error.
* Shipping documentation, such as commercial invoice, is returned for all countries in the API response, however, it might not be required for all countries.
* If you receive a Hold label in the API response, please follow the Exception Handling process as outlined by ESW or contact ESW for assistance.
* In the Package API, the `carrierID` is returned in the GET Package and Create Package responses. The `carrierID` identifies the carrier handling the package. The following table lists the unique ID for each carrier. Note that this information is for your reference only.
  {% endtab %}

{% tab title="carrierId Reference" %}
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{% endtabs %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## 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, and the optional `goal` query parameter:

```
GET https://developer.esw.com/package-api/resources/copy-of-additional-information.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.
