Hello is it possible for me to integrate a payment providers API into my website. A payment provider that wix doesn't use just yer

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2

Of course!

3

You can look at using Wix Fetch or Wix HTTP Functions.

https://www.wix.com/corvid/reference/wix-fetch.html
https://support.wix.com/en/article/corvid-accessing-third-party-services-with-the-fetch-api

https://www.wix.com/corvid/reference/wix-http-functions.html
https://support.wix.com/en/article/corvid-exposing-a-site-api-with-http-functions

You can see an example of exposing a site here.
https://www.wix.com/corvid/forum/corvid-tips-and-updates/example-myapi-and-myapiclient

Stripe example.
https://www.wix.com/corvid/forum/corvid-tips-and-updates/example-stripe-payment-processing

Finally, if any payment provider has a npm (nodeJS) that you can use instead, then have a look at Wix Package Manager and see if Wix have allowed it.
https://support.wix.com/en/article/corvid-managing-external-code-libraries-with-the-package-manager