Hi @Joep_Lamme,

I haven’t used Mollie but based on my experience with other payment providers like Stripe, there is no way around running your own backend for actually initiating the charge.

For security reasons, the backend has your authentication information and it’s the only piece in the puzzle that can “talk” to the payment processor.

Couple of notes to keep in mind:

• 
  

  Recurring/subscription payments are a bit harder to implement since you need a whole infrastructure behind the scene to handle things like expired cards, failed charges, customers who want to cancel their subscriptions and a few other cases.

  
  


• 
  

  You’re probably going to need to build your own payment forms from scratch since you can use an Unbounce form for it. This alone comes with a lot of potential headaches.

  
  

My suggestion would be to find a partner of Mollie that can provide you with the backend infrastructure as well as the payment form. After that you just need to load up the payment form as an iframe.

It’s not ideal but much easier to accomplish.

Best,

Hristian