Craig in Virginia asked:
Can you remind me where to look back to find the post about the service that allows you to require payment automatically when clients download images?
I'm talking with Pixieset (whom I've used for two years now) and they say they can do exactly this but not automatically.
The service that I've posted about in the past is PaymentTab.com. Payment on delivery is a good model for payment although most real estate photographers collect payment at the time of the shoot with Squareup.com.
Another payment upon delivery service is FileShip.io. The attractive feature about PaymentTab.com and FileShip.io is that payment for using the service is not a monthly charge.