---
updatedAt: 2026-08-28T22:31:44.000Z
agentTools:
  projectIndex: https://developer.wafeq.com/llms.txt
---

# Use case for B2B

Use Wafeq's e-invoicing API to send your customers compliant B2B e-invoices.

# Calling the API whenever you want to issue an invoice to your customer

In your app's code, simply call the e-invoicing API to send your customer an invoice.

You may want to include the `tax_registration_number` if your customer has one.\
See the [`Contact`](/docs/api-reference/api-invoices#contact) object for supported fields.