> For the complete documentation index, see [llms.txt](https://docs.cleartax.in/cleartax-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cleartax.in/cleartax-docs/gst-api-1/gst-api-reference.md).

# (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

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[(Deprecated) Invoices](/cleartax-docs/gst-api-1/gst-api-reference/invoices.md)
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[(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)
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[(Deprecated) Advances](/cleartax-docs/gst-api-1/gst-api-reference/advances.md)
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## Master APIs

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[Taxpayer Information](/cleartax-docs/gst-api-1/gst-api-reference/taxpayer-information.md)
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[(Deprecated) Items](/cleartax-docs/gst-api-1/gst-api-reference/items.md)
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[(Deprecated) Contacts](/cleartax-docs/gst-api-1/gst-api-reference/contacts.md)
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