How to use a federated primary key to do a foreign key

How do I use a federated primary key to do a foreign key?
I have a table where the primary key is the Federated primary Key, which is the foreign key in the other table, what should I do?
For example:
CREATE TABLE IF not EXISTS customers (
FirstName varchar (+) NOT NULL,
LastName varchar (+) NOT NULL,
Certificatetype varchar (+) NOT NULL,
Certificatenumber varchar (+) NOT NULL,
Gender varchar (6) NOT NULL,
Constraint Uc_customerid primary KEY (Certificatetype,certificatenumber)
);
CREATE TABLE IF not EXISTS cab_status (
ID int not NULL auto_increment PRIMARY KEY,
Roomname varchar (TEN) is not NULL,
Certificatetype varchar (+) NOT NULL,
Certificatenumber varchar (+) NOT NULL,
Foreign key () references customer ()
)";
I want to certificatetype,certificatenumber as the primary key of the customers, as the foreign key of the cab_status, what should the red place do?
Because it is possible to repeat a person's name, I like to use the document type and ID number as the primary key.


------Solution--------------------
Foreign key (Certificatetype, Certificatenumber) references customer (Certificatetype, Certificatenumber)

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