> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/instant-issuance/instant-issuance-es/integrar-la-api-de-d1/politica-de-cambios-de-la-api.md).

# Política de cambios de la API

Thales evolves the D1 API while keeping integrations stable.

Use this page to design your issuer backend to tolerate API changes.

### Backward compatibility rules

Design your issuer backend to tolerate API changes and extensions.

Your issuer backend must be resilient to these changes:

{% hint style="info" %}
Avoid **strict validation** in your issuer backend.

Strict validation rejects unknown fields.
{% endhint %}

* Thales may add optional parameters in HTTP headers, URLs, and JSON bodies.
* Error message strings may change between releases. Use them only for troubleshooting.
* Parameters sent or returned by D1 backend may evolve from optional to required.
* Parameters sent or returned by the issuer backend may evolve from required to optional.
* Parameter order is not fixed.
* New values may be added to existing enumeration parameters.
* New API operations may be added (new paths and/or HTTP methods).
* New HTTP response status codes may be added.

### Deprecations and end of life

Thales notifies the issuer at least **9 months** before end of life.

This applies to any API parameter or API operation.

After the deprecation period ends, do not use deprecated parameters or operations in:

* Production
* PreProd

Thales may shorten the deprecation period when required due to:

* A significant security risk
* A substantial economic or material technical impact
* Applicable law or payment network requirements

Deprecated parameters and operations are marked as deprecated in the technical documentation.


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