PayPal Deprecated API showing up in Google and other test

[COTM]

Hi All:

When testing my site with Google and others I keep on getting the exact same message.

Does anyone know why this is happening? Shopify Support told me to go to the Community.

PayPal works fine and is set up perfectly in my shop.

But this warning worries me and seems to say that Shopify uses an old API. 

Does anyone have a solution?

All answers are appreciated.

Thank you

[COTM]

While I thank you for your detailed answer, it is just a boilerplate.

1. I know what API's are

2. My original post said I already contacted Shopify support, and they had no answer and they were the ones who suggested here.

3. This is PayPal. There are no other 3rd party apps.

Your answers seem to come out of ChatGPT and have nothing to do with the problem at hand. 

The PayPal API that is being used by Shopify is being reported as deprecated. Look at the screenshot.

Does anyone have a useful suggestion here?