The page to complete payment in iDeal does not dispaly to user

Hi Patrick thanks a lot for this great plugin. I am having a challenge in setting it up correctly.

Mollie is properly configured, since i can see that the transactions are recorded, stays open for a while and then expired because the users never see them so they are not able to complete the payment.

When pasting the webhook Url of one of the transaction when being open https://groftalent.nl/wp-admin/admin-ajax.php?action=em_payment&em_payment_gateway=mollie i get the following errors:

API call failed: Invalid payment ID: ”. A payment ID should start with ‘tr_’.
Notice: Undefined variable: payment in /home/deb105388/domains/groftalent.nl/public_html/wp-content/plugins/stonehenge-em-mollie/gateway/gateway.mollie.php on line 259

Notice: Trying to get property of non-object in /home/deb105388/domains/groftalent.nl/public_html/wp-content/plugins/stonehenge-em-mollie/gateway/gateway.mollie.php on line 259

Notice: Undefined variable: payment in /home/deb105388/domains/groftalent.nl/public_html/wp-content/plugins/stonehenge-em-mollie/gateway/gateway.mollie.php on line 260

Notice: Trying to get property of non-object in /home/deb105388/domains/groftalent.nl/public_html/wp-content/plugins/stonehenge-em-mollie/gateway/gateway.mollie.php on line 260

Notice: Trying to get property of non-object in /home/deb105388/domains/groftalent.nl/public_html/wp-content/plugins/stonehenge-em-mollie/gateway/gateway.mollie.php on line 260

See screenshots for reference:

https://drive.google.com/file/d/1rdjLbz3agmX2c_Q7SqMAtAxxFj3xh0Hd/view?usp=sharing

https://drive.google.com/file/d/1EzHtLUuFX1BLnCRB0cQgUyYEFjTAasYv/view?usp=sharing

https://drive.google.com/file/d/1uo4QIDAKTF85CPBsm5cVDLGdO0W47QNu/view?usp=sharing

Thanks!

The page I need help with: [log in to see the link]