Prestashop 1.7 Webservice Authetication Error

Found the problem and solved the case in this way.

The problem is not releted to Prestashop or prestapyt but relative to the server configuration (Apache + PHP).

Considering that in my case I'm working in a managed cloud service, I don't have in depth information about that.

But the result of this configuration is that the Authorization header does not appear in the $_SERVER variable. The same behavior reported here:

Why are $_SERVER[“PHP_AUTH_USER”] and $_SERVER[“PHP_AUTH_PW”] not set?

I solved adding this statement to the .htaccess file in my Prestashop installation:

SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1

As suggested here.

I hope to help others Prestashop users that incur in the same problem.