Add PHPdoc to all methods, minor code reorder

Move some methods around to have them together by call order logic.

Also update current test methods with composer based .env reader.

psalm.xml

@@ -7,7 +7,7 @@
     xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
 >
     <projectFiles>
-        <directory name="src" />
+        <directory name="." />
         <ignoreFiles>
             <directory name="vendor" />
             <directory name="test" />