What do you mean by Membership ID?
Do you mean the ID of the level on the edit levels page of the dashboard? If you don’t have any members or orders yet, you can edit the wp_pmpro_membership_levels table to change the ID. If you do have members or orders already, you’ll have to also update the wp_pmpro_memberships_users and wp_pmpro_membership_orders tables. Other addons and bits of code may also rely on the level ID, so be careful of that if you change it.
Do you mean the ID given to users? We use the same user ID that WordPress generates and this cannot be changed. We have code we’ve shared on our site to generate a separate “member number” for members to be shared with them. You can search our site for those.
