Attachment targets are used to capture documents related to invoices. The most common example of this is the PDF version of the invoice.
Attachment targets are created together with invoices if they require attachments. Invoice intents can also capture attachments and they are inherited by the invoice, when it is finally created.
Delivery Mechanisms
The available attachment target types will vary depending on your account setup, but the most common are email and URL.
Email
The email attachment target providing a unique, temporary email address. Whenever a document that matches the requirements in terms of file type and content is received at this address it is attached to the invoice.
URL
The URL attachment target provides a signed URL that can be posted to.