If you use the membership card validation functionality for online purchases, you may want to be aware of the below website configuration options, that will determine the behaviour of how often membership cards can be used.
MEMCARDVALIDDAYS - The same membership card can’t be used on another transaction on the for this amount of days. Default is 100.
MEMCARDALLOWREUSE - Allow the same membership number to be validated against multiple items on the basket page.
If you cannot see these options in your website configuration options, please contact Merac Support to add these in for you.