To add payment instructions to a custom payment method, go to Settings > Events.
From here, click “Edit” next to the payment method.
Here you can add payment instructions for the specific method. This is especially useful to include bank account details for bank transfers etc.
After adding the instructions to your method, make sure you add the %payment_instructions% placeholder to either your invoice footer or header under Settings > Events as well, to ensure the instructions are included.
If you do not include the %payment_instructions% placeholder anywhere, the instructions will not be given to your registrants.