Why are no emails being sent?

Please check the following two points:

1. Is the plugin activated for the sales channel? Go to the plugin settings and select the relevant sales channel in the top right corner. The option "Active for this sales channel" must be enabled.
2. Is a sales channel specified in the payment reminder entry? Open the respective payment reminder entry (under Extensions --> ProxaPaymentReminder) and make sure that the desired sales channel is selected in the "Sales Channel" field.

Important: Both settings must be correctly configured at the same time - if either one is missing, no reminder emails will be sent for that sales channel.