Possible Cross Domain Product Check

Before reading this, please know that I am not a programmer and have limited knowledge of coding

SCENARIO:

I have two domains:
domainA.com (aMember installed in domainA.com/amember/)
domainB.com

I LOG IN to domainA.com normally through the amember login page.
then I go to domainB.com and want to access a member page.

MY SOLUTION:
I want to set up a php file on domainA.com/check.php that checks the users products. REMEMBER that the user is already logged in, so we are not relogging in. The php file looks somewhat like this:

//CHECK.PHP
$activeProducts = array(8);
foreach (Am_Di::getInstance()->user->getActiveProducts() as $product) {
if (in_array($product->pk(), $activeProducts)) {
echo "TRUE";
}
}

Then when I am on domainB.com i want to have a php file check for a html response that points to http://domainA.com/check.php to see if it's "TRUE"

WHAT I NEED HELP WITH:
Finishing the check.php file!! I don't know how I can "plug" into any amember functions without throwing errors. I know when I place that code in the _top.phtml file in amember/application/default/views and use the regular login script, I have it working, but i need a stand alone file without any other content that can be called from an outside domain.

Hi ALL... I answered my own question. Just read the Lite API documentation:

//CHECK.PHP​

include("library/Am/Lite.php");
//print_r(Am_Lite::getInstance()->getUser());
//print_r(Am_Lite::getInstance()->getProducts());
print_r(Am_Lite::getInstance()->haveSubscriptions(8) );
print_r(Am_Lite::getInstance()->getName());

and altered the .htaccess to allow this file

Hit a brick wall! I guess my limited knowledge of programming/server behaviour let be to a dead end

Any cross domain calls (with cURL) I make to aMember functions result in the script not firing.

I have discovered the REST api, but its not exactly what I want.

I need to make a call to aMemember from an external Domain and find out if there is an active login, and then what product ID i have.

The REST api, requires me to log in again, which is NOT what I want.

Is there any way I can have what I want???

PLEASE HELP

If I can't, is there a REST api call that I can make that checks if a user has a specific product, and not justa list of their products? I know I can parse the list, but I was hoping for a more cleaner approach.

Thank you in advance.