Automate Invoicing With Simple Invoice API

Highly reliable & secure Invoice API trusted by India's top startups

Generate & share Invoices automatically with zero downtime

View Documentation
Online Invoice API - Invoice Generator API
150k+ businesses across 178 countries simplify their invoicing with Refrens

Invoice API trusted by...

Refrens Invoice API is super easy to implement!View Documentation

How to get started with Refrens Invoice API?

Quick & easy setup with developer-friendly documentation
Register on Refrens for Invoice API
1. Register on RefrensRegister & create your business account with all details.
Enable Invoice API for Automated Invoice generation
2. Enable Invoice APIChat with our support team to enable Invoice API for your business.
Automate invoicing with Invoice API
3. Automate InvoicingSend API request to create & share invoices automatically.


  • Secure
    Reliable Invoice APIHighly reliable & secure Invoice API with zero downtime.
  • Simple DocumentationGet started quickly with our developer-friendly API documentation.
  • Invoice-Bill
    Robust AutomationCreate & share automated invoices within seconds.
  • Repeat
    Track InvoicesSend invoice via email & know when/if the invoice was opened.
  • Share-Doc
    Print, Download, and ShareShare invoices via email or links, download as a PDF or take a printout.
  • Live Chat Support
    Quick Live SupportWe are always available over email, call, WhatsApp, and live chat support.

Frequently Asked Questions (FAQ)

Do I need to pay to get started?

We offer a free trial for all our users to try out all our premium features. If you wish to upgrade the account or create invoices via API, a fee is charged.

Does Invoice work on all devices?

Yes, you can access your invoice anytime - whether you are at home, office or anywhere. You only need a mobile phone or laptop with internet connection and web browser.

What if I want to migrate to other software or tool?

Yes, you can migrate anytime. You can export all your invoices, quotations, proforma invoices and other such documents in CSV format which can be used to import on other software or tool.

Do you provide support?

We are always available to support our customer via email support( and also via live chat support.

Is my data safe?

Absolutely. Only you can decide who you want to share the invoices, quotations with. The documents you create are accessible only through special URLs that you share or PDFs that you download. We do not share your data with anyone for any purpose.

I have more questions. Who can I speak to?

Please ping us on chat support with your name, email and phone number details, we will get back to you. Or email us at

Do you have a Shopify Invoice API?

Yes, we also have a Shopify Invoice Plugin. Please get in touch with over chat support or email ( for more details.

Transforming Your Invoicing Process with Invoice APIs

In the digital age, businesses are constantly seeking innovative solutions to streamline their operations, enhance efficiency, and improve their bottom line. One area ripe for innovation is invoicing. This is where the power of an Invoice API comes into play, transforming the traditional, cumbersome process of creating, managing, and sending invoices into a seamless, automated workflow.

What is an Invoice API?

An Invoice API is a set of programming instructions and standards that allows software applications to communicate with each other to manage and automate invoice operations. It enables developers to integrate invoicing functionality directly into their business applications or e-commerce platforms, such as Shopify, thus eliminating manual data entry and reducing errors.

The Rise of GST Invoice API

For businesses operating within regions that require compliance with Goods and Services Tax (GST), managing tax compliance is a significant concern. The GST Invoice API is a specialized subset that not only automates invoice creation but also ensures that invoices are compliant with GST regulations. It simplifies the complexities involved in calculating tax rates, tax amounts, and generating tax-compliant invoice formats, making it an invaluable tool for businesses looking to streamline their GST invoicing process.

Shopify Invoice API: Tailored for E-commerce

Shopify, one of the leading e-commerce platforms, offers its own Invoice API, allowing merchants to create, send, and manage invoices directly within the Shopify ecosystem. The Shopify Invoice API is designed to cater to the unique needs of online retailers, providing a seamless integration with the Shopify store and enabling automated invoice generation upon order placement. This not only enhances operational efficiency but also improves the customer experience by ensuring timely and accurate billing.

Benefits of Implementing an Invoice API

The advantages of integrating an Invoice API into your business operations are manifold:

1. Efficiency and Time Savings: Automation reduces the time spent on manual invoice processing, allowing businesses to allocate resources to more strategic tasks.

2. Accuracy and Reduced Errors: By minimizing manual data entry, the chances of errors are significantly reduced, leading to more accurate billing and fewer disputes.

3. Improved Cash Flow: Faster invoicing can lead to quicker payments, improving the business's cash flow.

4. Scalability: As your business grows, an Invoice API can easily handle an increasing volume of transactions without the need for additional resources.

5. Compliance: For businesses subject to specific tax regulations, like GST, specialized APIs ensure that invoices are always compliant, reducing the risk of penalties.

Choosing the Right Invoice API

When selecting an Invoice API, consider the following factors:

1. Integration: Ensure the API integrates seamlessly with your existing systems and workflows.

2. Customization: Look for an API that offers customizable invoice templates to match your brand.

3. Security: Choose an API that provides robust security features to protect sensitive financial data.

4. Support: Consider the level of support and documentation provided to facilitate a smooth integration process.

In the quest for operational efficiency and compliance, an Invoice API stands out as a key tool for businesses across various sectors. Whether you're in need of a GST Invoice API to comply with tax regulations or seeking a solution like the Shopify Invoice API to enhance your e-commerce operations, the right Invoice API can significantly transform your invoicing process. By automating and streamlining billing operations, businesses can focus on growth and innovation, leaving the complexities of invoicing to their chosen API solution.