I am trying to add some PHP includes files into Drupal 7 site. The files are on this page - https://developer.salesforce.com/docs/atlas.en-us.noversion.mc-apis.meta/mc-apis/connecting_to_the_api_using_php.htm under the "Required PHP Includes" heading. It looks like I need these files: soap-wsse.php, exacttarget_soap_client.php, xmlseclibs.php in my Drupal install.
I will need to use the require('exacttarget_soap_client.php') function in a Drupal custom module.
My question is where to place these files in the file structure of Drupal and what would be the $type using drupal_get_path() function? Should I be using the Libraries API instead?