ArrayToXML::isAssoc() – Check if array is associative with string based keys FROM: http://stackoverflow.com/questions/173400/php-arrays-a-good-way-to-check-if-an-array-is-associative-or-sequential/4254008#4254008
EDD_Amazon_Payments::is_setup() – Method to check if all the required settings have been filled out, allowing us to not output information without it.
EDD_API::invalid_auth() – Displays an authentication failed error if the user failed to provide valid credentials
EDD_API::invalid_key() – Displays an invalid API key error if the API key provided couldn’t be validated
EDD_API::invalid_version() – Displays an invalid version error if the version number passed isn’t valid
EDD_Batch_Import::convert_file_string_to_array() – Convert a files string containing delimiters to an array.
EDD_Batch_Import::get_import_type_label() – Retrieve the label for the import type. Example: Payments
EDD_Batch_Import::init() – Initialize the updater. Runs after import file is loaded but before any processing is done.
EDD_Batch_Payments_Import::maybe_create_download() – Look up Download by title and create one if none is found
