Membership updates allow customers to update their share types themselves. For example, say you start your membership sign-up in November. In March, you buy a few hundred chicks so you can start offering egg shares to your CSA customers and you create a new "Egg Share" member option in the Member Assembler. This new offering will be seen by all new customers that sign up after March, but what about the other members that signed up in November?
At that point, you'll turn on Membership Updates, allow Egg Shares to be updated, and the customers who have already signed up can use the Membership Updates to add the Egg Share to their membership.
Adding Update Types to your Membership Updates
Read more about the tool and how to get it to work here.