GST e-Invoice API Solutions | IRN, QR Code & Billing Automation

GST e-Invoice API ‐ Simplify Compliance & Automate Invoicing

Powerful, custom APIs to generate IRNs, QR codes, and GST invoices‐built for fast integration and multi-source data inputs.

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Our e-Invoice API Offerings

Reduce change impact with Custom Input/Output

Custom eInvoice APIs

  1. REST API integration with custom Inbound and Outbound payloads
  2. Supports XML, JSON, CSV, and proprietary formats
  3. Merge multi-input data with reference/master data
  4. IRN & eWay Bill generation with QR code creation

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SFTP based eInvoice generation

  1. Scheduled or event-triggered generation via SFTP/S3
  2. Multi-source data support (SAP, Oracle, custom ERP)
  3. Ideal for high-volume batch processing
  4. Integrates digital signatures & PDF templates

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Combined e-Invoice & e-Way Bill APIs

  1. Generate both IRN and EWB in one API call or file upload
  2. Includes enriched APIs calling multiple NIC endpoints
  3. Supports payload customization
  4. Real-time or batch upload modes

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Why Choose Adaequare's e-Invoice APIs?

Pricing Options

IRN Pass Through APIs

Reliable, cost-effective invoice IRN generation

0.25

IRN + eWay bill (Custom APIs)

RN & EWB in one API request

0.40

RN + eWay Bill (Custom Payloads)

Post/Get APIs for batch or single transactions

0.80

IRN + eWay Bill + GSTR1 Transfer APIs

Complete solution for GSTR1 auto-preparation

1.50

Benefits of Our e-Invoice API Integration

  • Fast & Flexible Integration

    Minimal ERP changes required

  • Data Accuracy

    Syncs with master data to reduce manual errors

  • Time & Cost Saving

    50% reduction in integration and maintenance effort

  • Scalable Infrastructure

    Built for enterprise-grade transaction volumes

  • Complete Compliance

    Automates e-invoice mandates and GSTR-1 submission

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Frequently Asked Questions

1

What is an IRN and why is it important for GST invoicing?

An IRN (Invoice Reference Number) is a unique number generated for every invoice by the Invoice Registration Portal (IRP). It's mandatory for GST compliance.

2

How is a QR code generated using your API?

Our APIs automatically generate the QR code post-IRN creation. You can integrate it with PDF templates or ERP systems.

3

Can I use your APIs for real-time or batch invoicing?

Yes. We support both real-time REST API integration and scheduled batch uploads via SFTP.

4

How do you ensure e-invoice compliance for multiple GSTINs?

Our system is designed to handle multiple GSTINs with user-specific configurations and master data sync.

5

What ERPs can your APIs integrate with?

We support integration with SAP, Oracle, Tally, Zoho, and custom-built ERPs via REST or SFTP connectors.