Information from Seperate Table

for my visualization, I have a table that shows sales. This uses information from 2 tables:

Payments: (which contains information on the actual sale such as amount, tip, credit card information vs cash, and ID). The ID is unique to that transaction.

Customers: Contains information like name, email, ect. This also has the ID column that is unique to their transaction. 

For my visulization I have total, tip, Full name (which is a created column in customers which combines first and last name), and date.

However, it doesn't display "full name". I'm guessing this is because I need some type of DAX that tells it to tie each row in each table together

How do I make it so it knows that it should pull the full name based of the ID in both tables? I've tried a one to many and a many to many relationship, neither seem to work.