> 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/e-invoicing-api/learn-e-invoicing-api-basics/how-to-add-gstin-to-e-invoicing.md).

# How to add GSTIN to E-Invoicing?

1\. Log in to your ClearTax E-Invoicing sandbox demo account - <https://app.clear.in/>or your ClearTax E-Invoicing production account-<https://app.clear.in/> based on which environment auth token you want to generate.

![](/files/-MIEdgzFwQNkgz9Mraty)

2\. On the bottom left corner click on “Settings”.

![](/files/-MgF8jqzoLC0oP6qmi2K)

3\. On the sidebar menu, click on “Business Settings” and then click on the “Add New Business” button. You will see a modal window like below.

![](/files/-MgFC0f7--ez1JHsr0Oy)

4\. In the “GSTIN” field, type “29AAFCD5862R000”. In the “Display Name” field, type
&#x20;“Sandbox Karnataka”. In the “NIC API Username” field, type “cleartax”. In the “NIC
&#x20;API Password” field, type “Defmacro\@123”. And then click on the “Add Business”
&#x20;button.

![](/files/-MgFCC8Y5uzYX4SYE07j)

5\. Repeat steps 3 and 4 above for all the sandbox GSTINs as per your usage.&#x20;

NIC API Credentials - [The list
&#x20;of available Sandbox GSTIN, NIC username and password is available on this page. ](https://docs.cleartax.in/cleartax-docs/e-invoicing-gsp-api/getting-started-with-einv-gsp-api/sandbox-gstin-for-einv-gsp)

Clear IRP API Credentials - [The list of available Sandbox GSTIN, Clear IRP  Username and Password is available on this page. ](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/learn-e-invoicing-api-basics/how-to-add-gstin-to-e-invoicing/clear-irp-api-credentials)

<figure><img src="/files/sLcpYG7WHFB5wBoH4fJw" alt=""><figcaption></figcaption></figure>