This method will copy the contents of an folder into another folder.
Parameters
ID of the folder containing the files that should be copied.
ID of the folder where the files should be copied to.
Return
The result of the copy operation.
Usage
WPCP_GDRIVE_API::set_account_by_id('201096615285735764133')
$result = WPCP_GDRIVE_API::copy_folder_recursive('1FCYkOJb150I8nl8DE92YIXWaB0J7VOk5', '1eedpdrZPBHpPKblQwa3khFcka1A2l0oL');