I have integrated in my website,but it gives the error.

I have added the below code and when try to test at that time. One button display when I click on it at that time one loading popup display and display below error in console.

"Access to fetch at 'https://demo-connect.progleasing.com/progconnect/api/v1/authorize' from origin 'https://www.vallianijewelers.com' as been blocked by CORS policy: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Credentials' header in the response is '' which must be 'true' when the request's credentials mode is 'include'."