Mollie's HubSpot Marketplace App

Mollie wanted to make it easier for European B2B companies to use its efficient payment solution. So, Wiljekoffie delivered a HubSpot integration that brings streamlined payment capabilities to thousands of businesses while maintaining Mollie's commitment to simplicity.

Client

Year

2024 - now

Services provided

Custom Integration, HubSpot Marketplace App

About the project

HubSpot users were actively searching for Mollie in the marketplace, signaling strong demand for integrated payment capabilities. B2B companies found themselves juggling multiple platforms – managing deals in HubSpot while separately creating and tracking payments in Mollie. This fragmented workflow not only consumed valuable time but also increased the risk of errors and delayed payment processing.

Mollie needed a technical partner who could bridge this gap while maintaining their reputation for user-friendly payment solutions. The integration had to be sophisticated enough to handle complex B2B payment workflows yet simple enough for everyday users.

The solution

Rather than building a feature-heavy integration that would overwhelm users, Wiljekoffie took a focused approach. We developed a solution that seamlessly embedded payment functionality into HubSpot's existing deal workflow, where B2B users spend most of their time.

Key technical decisions that shaped the integration:

Custom CRM Cards: Instead of creating a separate interface, Wiljekoffie integrated payment functionality directly into HubSpot's deal view. This allows users to manage payments without leaving their familiar CRM environment.
Workflow Automation: Wiljekoffie integrated with HubSpot's Workflow engine to automate payment link distribution. When a deal reaches the "quote signed" stage, the system automatically generates and sends payment links to customers, eliminating manual steps and accelerating the payment process.
Intelligent Middleware: Wiljekoffie developed a sophisticated middleware solution that handles the complexities of payment link generation and status tracking. This ensures payment links remain valid and statuses stay current without requiring user intervention.
Timeline Integration: By leveraging HubSpot's Timeline Events API, Wiljekoffie made payment activities visible within the customer's history. This gives sales teams complete visibility into payment status without switching platforms.

Our process and priorities

Our development process prioritized security and user experience:

Discovery: Conducted user interviews to understand specific B2B payment workflows
Architecture: Designed a middleware solution to bridge HubSpot and Mollie's APIs
Development: Built the integration using HubSpot's Custom Cards and Timeline Events API
Testing: Implemented comprehensive QA testing, including installation flows and error handling

“The Mollie HubSpot integration offers a simple, efficient way for our customers to get paid faster, allowing them to focus on growing their business.”

Savannah van Lit - Integration Manager at Mollie

Technical architecture

The Mollie-HubSpot integration demonstrates our commitment to secure, scalable, and maintainable solutions:

Security first

Dual OAuth implementation securing both Mollie and HubSpot connections
Webhook security through HubSpot signature verification
Minimalist data storage approach, collecting only essential synchronization data with zero storage of sensitive customer information

Modern development practices

Built with TypeScript and Express.js
Clean Architecture principles using Inversify.js for dependency injection
AWS Application Load Balancer enabling automatic scaling for enterprise-level demands

This technical foundation showcases why platforms like Mollie trust Wiljekoffie for their integration needs.