Receipt Text - Allows a message to be entered into the email that is automatically sent to a donor after they have made a donation. This could be a specific message with instructions etc. This needs to be configured for each donation link if you wish to use.
Success URL - This is optional but will allow the donor to be sent to a webpage of your choosing after the donation payment has been successful. This may be your homepage or a specific page you have created with further instruction etc.
Webhook URL - This is for use by developers or individuals confident that they can configure webhooks.