Issue with Afterpay Extension - Magento 1.9

Question

I am using Magento v 1.9.3.10,
We had an error with Afterpay not working last week, so I upgraded to the latest version and it worked ok.
However we couldn't use the other 2 payment methods (Credit card and Paypal). When they are selected in the checkout, the "Place order now" button doesn't do anything. So I tried to go back to the previous Afterpay version, now it doesn't work and it doesn't let me put the secret key in the backend. it gives an error

"An error occurred while saving this configuration: Invalid header line detected"

both in frontend and Admin. Any help is appreciated. Thanks heaps

Answer 1

The Afterpay Magento 1 plugin v3.0 has been provided at the below URL:

o URL: https://github.com/afterpay/afterpay-magento