ViserLab successfully customized eSIM – our International eSIM and Data Purchase Platform – for Mobilexy.

We built a complete, secure, and well-documented REST API that allows third-party developers, resellers, travel apps, and affiliates to programmatically browse plans, purchase eSIMs, generate QR codes, check status, and receive real-time updates.

Who the Client Is

Mobilexy is a modern global eSIM provider offering instant digital SIM activation, affordable data plans across 100+ countries, a money-back guarantee, QR-code setup, and a generous referral program.

Trusted by travelers and businesses, Mobilexy focuses on seamless, borderless connectivity without the hassle of physical SIM cards.

Problems They Were Facing

The base eSIM platform was excellent for direct customers, but lacked any public API:

• Affiliates and resellers had to place orders manually.
• Travel agencies and app developers couldn’t embed eSIM purchases inside their own platforms.
• No programmatic access to plans, orders, QR codes, or activation status.
• Missed opportunities for automation and B2B partnerships.

Their Vision & Goals

• Launch a powerful, secure public API for all eSIM operations.
• Enable automated purchases, QR generation, order tracking, and balance checks.
• Add webhooks for real-time notifications.
• Provide clear documentation and easy integration for partners.

How We Helped

ViserLab delivered a production-ready RESTful API layer:

• Secure authentication (API Key + JWT)
• Endpoints for plans, purchase, QR code retrieval, activation status, refunds, etc.
• Webhooks for instant order & activation events
• Full OpenAPI/Swagger documentation + Postman collection
• Rate limiting, logging, and enterprise-grade security

All were built directly on top of the existing eSIM platform without disrupting the user-facing site.

Our Approach & Process

We followed an agile process with regular client testing:

1. Designed clean REST endpoints with consistent responses and error handling.
2. Implemented secure authentication and permission controls.
3. Added webhook support for real-time updates (purchase confirmed, QR ready, activated, etc.).
4. Created comprehensive developer documentation with live examples.
5. Performed security audits, load testing, and provided a sandbox environment.

The API was launched with zero downtime and full backward compatibility.

Results We Delivered

After launch:

• Multiple partners integrated the API within the first month.
• Automated reselling increased eSIM sales volume significantly.
• New B2B and affiliate revenue streams opened quickly.
• Developer adoption grew fast thanks to clean documentation and sandbox testing.

What the Client Says

“ViserLab delivered a rock-solid, well-documented API that exceeded our expectations. Our partners now integrate Mobilexy eSIMs effortlessly, and it has unlocked huge growth opportunities. The team was fast, professional, and super helpful every step of the way. Highly recommended!”

— Team Mobilexy

Long-Term Business Value

Thanks to the new API, Mobilexy has:

• Expanded into B2B, affiliate, and white-label channels
• Increased overall sales through automation
• Positioned itself as a developer-friendly eSIM provider
• Gained a strong competitive advantage in the fast-growing eSIM market

eSIM once again proved how flexible and powerful it is when extended with the right integrations.

Ready to launch your own eSIM business with a full developer API?

Get the eSIM platform now → eSIM – International eSIM And Data Purchase Platform

Contact us for custom API development, integrations, or any other features.