---
url: /gst-manager-shopify/features/gstin-capture.md
description: >-
  The four ways GST Manager captures a buyer's GSTIN on Shopify — the cart-page
  Theme App Embed, native B2B Company tax IDs, customer records, and admin
  override.
---

# Capturing the GSTIN

To issue a B2B tax invoice with input tax credit (ITC) for your customer, GST Manager needs the buyer's 15-character **GSTIN**. The app captures this through four different methods, making it compatible with any Shopify plan.

![Cart page with the Get GST Invoice checkbox and GSTIN input fields](/gst-manager-shopify/img/gst-manager-shopify-cart-embed.png)
*Storefront cart page → Get GST Invoice block*

## 1. Cart-page block (Theme App Embed)

This is the standard method for most stores. A clean block appears on your cart page where customers can opt in:

1. The customer checks **"Get GST Invoice"**.
2. Input fields appear for **GSTIN** and **Company Name**.
3. The customer enters their details and clicks **Save**.
4. The GSTIN is saved directly to the order as a cart attribute.

### How to enable the cart block

1. In Shopify admin, go to **Online Store → Themes**.
2. Click **Customize** on your current theme.
3. Click the **App embeds** icon on the left sidebar (third icon from top).
4. Find **Collect Customer GST** and toggle it **On**.
5. Click **Save** in the top right.

::: tip Custom CSS styling
The app embed settings include a **Custom CSS** textarea so you can adjust fonts, colors, and borders to match your store's branding.
:::

## 2. Shopify B2B Companies (Pro plan)

If you use Shopify Plus B2B:

1. Enable **Use Shopify B2B Companies as canonical GSTIN source** in **Settings → Other Settings**.
2. When a B2B customer places an order, the app automatically reads their GSTIN from the **`CompanyLocation.taxRegistrationId`** field in Shopify.
3. The buyer does not need to re-enter their GSTIN on the cart page.

## 3. Saved customer records

For returning buyers:

* The app remembers GSTINs previously used by a customer.
* In **Settings → Other Settings**, you can choose to allow buyers to switch between multiple GSTINs, or automatically lock the field to their existing GSTIN.

## 4. Admin override

If a customer forgot to enter their GSTIN at checkout:

1. Open **Apps → GST Manager → Orders**.
2. Click on the order.
3. Click **Regenerate** to update the buyer details and enter the GSTIN manually.
4. A revised tax invoice is generated with the customer's GSTIN.

## Supply type classifications

Every order is automatically classified and tagged with a badge in your Orders list:

* **B2B** — buyer provided a valid GSTIN; eligible for input tax credit.
* **B2C Large (B2CL)** — inter-state order without GSTIN above ₹2.5 Lakhs.
* **B2C Small (B2CS)** — order without GSTIN below ₹2.5 Lakhs.
* **Export** — international orders with zero-rated or exempt supply.

## Related pages

* [Invoices & credit notes](/gst-manager-shopify/features/invoices) — how invoices are generated
* [GST reports](/gst-manager-shopify/features/reports) — how supply types roll up into GSTR-1
* [Settings reference](/gst-manager-shopify/settings) — customer GST preferences
* [Quick setup wizard](/gst-manager-shopify/guides/onboarding) — initial setup