# (Deprecated) GST 1.0 API Reference

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**IMPORTANT NOTICE**

GST 1.0 APIs are deprecated and will not be supported after 30-11-2022. If you want to integrate with ClearTax GST, please use [GST 2.0 APIs](https://docs.cleartax.in/cleartax-docs/gst-api/gst-2.0-api-reference) instead.
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## Document APIs

{% content-ref url="gst-api-reference/invoices" %}
[invoices](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference/invoices)
{% endcontent-ref %}

{% content-ref url="gst-api-reference/bills-of-supply" %}
[bills-of-supply](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference/bills-of-supply)
{% endcontent-ref %}

{% content-ref url="gst-api-reference/credit-debit-notes" %}
[credit-debit-notes](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference/credit-debit-notes)
{% endcontent-ref %}

{% content-ref url="gst-api-reference/advances" %}
[advances](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference/advances)
{% endcontent-ref %}

## Master APIs

{% content-ref url="gst-api-reference/taxpayer-information" %}
[taxpayer-information](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference/taxpayer-information)
{% endcontent-ref %}

{% content-ref url="gst-api-reference/items" %}
[items](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference/items)
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{% content-ref url="gst-api-reference/contacts" %}
[contacts](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference/contacts)
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