Creates a new static audience based on file.

The audience represents a set of recipients for the campaign. It consists of contact data that will be used to launch the campaign.

To upload a file you'll need to send a request of type multipart/form-data. The request should contain the file you would like to upload, as well as the parameters for creating a audience.

The file will go through a series of checks to validate that it is correctly formatted and meets specifications. We return an error for uploads that fail any of our checks.

Checks we perform:

• File extension.
• File size.
• Number of lines.
• File header.
• Column separator.
• Field format.