Why Lime Booking, an Advanced Appointments Booking App Integrated Global Invoicing API

More features don’t always mean more value—too many, and users leave. Smart businesses focus on solving real problems. One of those? Invoicing. Lime Booking didn’t just add another feature. They made invoicing a seamless, revenue-generating advantage.

Lime Booking

Industry: Scheduling & Appointment Management

About: Lime Booking is an online platform designed to streamline appointment scheduling and client management for businesses. It simplifies bookings, reduces administrative workload, and enhances client communication through automated features.

Type: B2B2C

Website: https://limebooking.com/

Key Results

  • Enhanced Platform Value
  • Automated & Compliant Invoicing
  • Time & Cost Savings
  • New Revenue Stream

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    Instead of wasting time building their own system, they found an API that worked instantly—ensuring compliance, easy integration, and a new revenue stream.

    Here’s how they made the right choice—and how you can, too:

  • Get To Know Lime Booking
  • Lime Booking’s Plan To Become the One-Stop Shop
  • Challenge With Choosing an Invoicing API
  • The Solution
  • The Results
  • Integrate Invoicing Feature In A Week

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    Get To Know Lime Booking

    Lime Booking is an online application designed to streamline appointment scheduling and client management for businesses. Its primary goal is to simplify the booking process, reduce administrative tasks, and enhance communication between service providers and their clients.

    Key Features:

  • Online Calendar: Provides a comprehensive view of available and booked appointments, accessible via computer or mobile device.
  • Online Forms: User-friendly forms that allow clients to schedule appointments at their convenience.
  • Automatic Notifications: Reduces no-shows by sending automatic SMS or email reminders to clients.
  • Analytics: Offers insights into business performance, including appointment statistics and client data.
  • Online Payments: Enables clients to make advance payments for services online.
  • Timetables: Manages employee work schedules, including breaks and time off.
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    Lime Booking’s Plan To Become the One-Stop Shop

    Lime Booking is an advanced appointment booking app in a highly competitive market. To stand out, they needed to outwork and outsell the competition by offering real value—without cluttering their platform with unnecessary features.

    Once they covered essential functions like push notifications, online booking, payments, and timetables, they focused on adding value without overcomplicating the platform. Too many useless features confuse users and make them feel they’re paying for nothing, leading them to switch providers.

    That’s why they chose to integrate invoicing—a simple yet powerful addition that solves a real problem for SMEs. Manual invoicing is:

  • Expensive and time-consuming
  • Prone to errors and compliance risks
  • Now legally required as e-invoicing becomes mandatory in multiple countries

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    Challenge With Choosing an Invoicing API

    Building an invoicing API in-house would have taken years, with complex country-specific regulations and high developer costs making it an impractical solution. Instead, integrating a third-party API was the smarter choice. However, they couldn’t just use any invoicing API—most are designed for single users in a single country.

    To ensure a seamless and scalable solution, the API had to meet key selection criteria:

  • Multitenancy – Allowed both Lime Booking and its clients to use the same invoicing system while maintaining data security and separation.
  • White-Labelling – Brand trust was essential. A third-party add-on might create doubts, but a white-labelled solution ensured invoicing felt like a native feature within Lime Booking.
  • Global Compliance – The API needed to support various country regulations, allowing clients in all Lime Booking markets to invoice compliantly.
  • Reliability & Credibility – A trusted provider with proven stability, regulatory expertise, and years of experience was crucial to avoid unreliable or outdated solutions.
  • Support for Upselling – Clients could onboard immediately, and Lime Booking had the flexibility to offer invoicing as part of their service package or upsell it separately—creating a new revenue stream.
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    The Solution

    They chose Space Invoices’ Invoicing API because it provided all the essential features, including white-label support, specifically designed for upselling and enhancing platform services for their clients. With comprehensive documentation and responsive support, Lime Booking integrated the API within weeks, allowing them to:

  • Test the system and ensure smooth functionality.
  • Accurately predict costs with Space Invoices’ transparent pricing.
  • Attract more clients and gain a competitive edge.
  • Spend minimal time on invoicing while generating significant value in return.

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    The Results

    Lime Booking has built a strong presence in Slovenia and is now expanding into new markets across the Balkan region. Positive client feedback confirms that the software has streamlined operations and enhanced customer satisfaction for many businesses.

    It has also gained industry recognition, being listed in the EU-Startups directory, further solidifying its position in the European startup ecosystem.

     

     

    Integrate Invoicing Feature In A Week

    Are you a scheduling app, looking to expand your services with invoicing? Whether you want to offer more value to your clients or even upsell them, you’re in the right place. With Space Invoices' Invoicing API, you can:

  • Use one API for current and future global tax and invoicing compliance.
  • Support and upsell your clients worldwide, creating a new revenue stream.
  • Ensure all invoices are archived and successfully reported to regulatory institutions.
  • Become a one-stop shop for current and future clients.
  • Streamline processes and eliminate manual errors, saving both time and money.

    • Have questions about invoicing features for your app?

    We’re ready to help.

    Additional reading:

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