This module is created as a support for https://github.com/mollie/magento2
For this module to properly work you need to change the return URL within the Mollie configuration settings in the Magento backend.
Go to: Mollie -> Advanced -> PWA Storefront Integration -> Use custom return URL -> yes
And change the Custom return url to:
https://<your-scandipwa-store.url>/mollie/checkout/response?payment_token={{payment_token}}&increment_id={{increment_id}}