If you don't have a Stripe account yet, create one here: https://dashboard.stripe.com/register. After that, you can integrate it to your admin portal's system by going to Stripe Settings and clicking Verify Account.

You will then be directed to a site wherein you can fill up your personal and business details. After you submit your information, you'll be directed back to the portal. Go to Stripe Settings and update your bank account information. For a more detailed explanation, please visit this page.