Trying to integrate PayPal account into my wordpress website and it is redirecting me to the old domain which is not active ... why? [closed]

The whole scenario is: While I was in the middle of integrating PayPal into my WordPress website, I saw that PayPal was asking me to add a website address where I needed to link my PayPal account. Since I was using a temporary domain provided by Hostinger for my website, I decided to move it to a permanent domain. After completing the migration, I finished integrating my PayPal account. However, when PayPal gave me the option to return to WooCommerce, it redirected me to the old domain.

Old temporary domain: https://pink-penguin-659133.hostingersite.com/
New Domain: https://manxmerchandise.com

I have tried everything including checking the database tables for any old URL clearing my WordPress cache, and clearing my browsing cache nothing works and the problem still exists

here are the screenshots that might help the readers more:

screenshot of the new url

In the bottom left corner you can see that after completion of login into PayPal when I click on the go to woocommerce instead of redirecting to the new domain it redirects to the old domain which doesn't exist anymore

this happens when I click on the go to woocommerce button