How can I manage multiple certificates?

I work on integrating online payment gateways.

We are currently integrating Stripe and Adyen payment gateways. However, when integrating with Stripe, we use the certificate file provided by Stripe, and for Adyen, since there are not many payment transactions, we cannot create our own account, so we are using an account from a partner company. Therefore, we also have to use the Apple Pay certificate file from the partner company.

In other words, the certificate files for Stripe and Adyen are different, but we want to get verification for the same domain.

How can we set up to differentiate between Stripe and Adyen for the same domain with two different certificate files?

The framework we are using is React.js for the frontend and Node.js for the backend.