Add a message which automatically gets sent out to members when a payment/donation is registered.
Original plan
- Confirmation message [rich text] - The thank you message for returning members
- Version for members that are organisations
- Extra optional paragraph if they also made a donation when renewing their membership
- Confirmation message [rich text] - The thank you message for new members
- Version for members that are organisations
- Extra optional paragraph if they also made a donation when starting their membership