You can use following PHP code to get the Steam ID of user:
<?php
global $user_ID; // user ID of current logged in user
if ( get_user_meta( $user_ID, 'thechamp_provider', true ) == 'steam' ) { // check if user logged in using Steam
$steamID = get_user_meta( $user_ID, 'thechamp_social_id', true ); // Steam ID of the user
}
?>
