To associate a card with a customer, we must first access the customer to whom we want to associate the card. For this we must access Customers → Customers.
Once we have entered, we will see the list of clients and we will look for the client to whom we want to associate a card to him and we will press the icon 
:
When we have entered, we will go to the Access Control section:
Here we will click the Create Pass icon to assign a card to the client.
Once we have clicked on "Create pass", we can choose the type of pass, the code to print and if you use PIN.
Finally, we can register the new pass or sign up and print it.