Missing right parenthesis ORACLE SQL?

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SQL

Oracle

I run my code on sql oracle and it continues to show me missing right parenthesis. I tried everything even adding a comma and im not sure where the error is at.

CREATE TABLE Trips( 
Trips_ID NUMBER NOT NULL PRIMARY KEY,  
Date_of_Trip DATE NOT NULL, 
Payment NUMBER NOT NULL,
Destination_Town VARCHAR2(50) NOT NULL, 
Source_Town VARCHAR2 (50) NOT NULL,

Customer_ID int FOREIGN KEY REFERENCES Customer(Customer_ID),
Owner_ID int FOREIGN KEY REFERENCES Owners(Owner_ID),
Payment_ID int FOREIGN KEY REFERENCES Payment (Payment_ID));

What I have tried:

I have tried comma and putting right parenthesis but none is working.