# (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](/cleartax-docs/gst-api/gst-2.0-api-reference.md) instead.
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## Document APIs

{% content-ref url="/pages/-LwX82B2UBn3skUdVBIr" %}
[(Deprecated) Invoices](/cleartax-docs/gst-api-1/gst-api-reference/invoices.md)
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{% content-ref url="/pages/-LwX8PKJP-pr420ENtug" %}
[(Deprecated) Bills of Supply](/cleartax-docs/gst-api-1/gst-api-reference/bills-of-supply.md)
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{% content-ref url="/pages/-LwX8H5CwK\_PcCN5RZTy" %}
[(Deprecated) Credit Debit Notes (CDN)](/cleartax-docs/gst-api-1/gst-api-reference/credit-debit-notes.md)
{% endcontent-ref %}

{% content-ref url="/pages/-LwX8Ki16afjrhNywNNr" %}
[(Deprecated) Advances](/cleartax-docs/gst-api-1/gst-api-reference/advances.md)
{% endcontent-ref %}

## Master APIs

{% content-ref url="/pages/-LwX7QYHetiLiTxRSdTU" %}
[Taxpayer Information](/cleartax-docs/gst-api-1/gst-api-reference/taxpayer-information.md)
{% endcontent-ref %}

{% content-ref url="/pages/-LwX8jlHoPGdbPQnXXNh" %}
[(Deprecated) Items](/cleartax-docs/gst-api-1/gst-api-reference/items.md)
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{% content-ref url="/pages/-LwX8mZT0TvwvAAuc-ca" %}
[(Deprecated) Contacts](/cleartax-docs/gst-api-1/gst-api-reference/contacts.md)
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