Custom Integration of Payment Gateway Mollie with Sticky.io CRM

Mollie Payment Integration with Sticky.io CRM (Custom HTML/JS)

I’m looking for an experienced developer to help me integrate Mollie as a payment gateway on my website, which is built using SubscribeFunnels and connected to Sticky.io as my CRM.

Current Setup
Funnel platform: SubscribeFunnels
CRM: Sticky.io
Payment gateway needed: Mollie & SpotOn
Payment type: One-time purchases only
Funnel includes: Main checkout + 1 upsell
Option if possible: Process the transaction through Mollie, if declined try it on SpotOn or vice versa

Sticky.io is already connected to my fulfillment center and must continue receiving order data.

Important Context

Sticky.io does not support Mollie as a native payment gateway.
This means: Mollie will NOT be added inside Sticky.io, Sticky.io core will NOT be modified and no rebuilding of the funnel

Instead, this must be done via a custom workaround using: Mollie API & webhooks
Sticky.io public API, Pure HTML + JavaScript (SubscribeFunnels)

What the Integration Must Do: Accept payments via Mollie on the SubscribeFunnels checkout and after successful payment: Send customer data, order details, and payment status to Sticky.io Ensure orders appear correctly in Sticky.io so fulfillment continues normally

Support: One-time purchases, One upsell, Handle payment success / failure states properly, Be secure, reliable, and tested end-to-end

What This Project Is NOT, Not a native Sticky.io gateway integration, Not a plugin installation, Not a Stripe replacement, Not a funnel redesign, Not subscription logic (no recurring billing)

Strong experience with: HTML & JavaScript, Payment APIs (Mollie preferred), Webhooks, CRM API integrations (Sticky.io or similar), Clean, documented implementation, Basic testing to confirm orders reach Sticky.io correctly