Email attachments
Email attachments can be configured as shown below.
plugin.tx_cart {
    mail {
        // Used for emails sent to the customer (=buyer)
        buyer {
            attachments {
                1 = EXT:sitepackage/Resources/Public/Files/AGB.pdf
            }
            // This needs EXT:cart_pdf to work!
            attachDocuments {
               order = 1
               invoice = 1
               delivery = 1
            }
        }
        // Used for emails sent to the shop owner (=seller)
        seller {
            attachments {
                1 = EXT:sitepackage/Resources/Public/Files/AGB.pdf
            }
            // This needs EXT:cart_pdf to work!
            attachDocuments {
               order = 1
               invoice = 1
               delivery = 1
            }
        }
    }
}plugin.tx_cart.mail
buyer.attachments.<n>
- 
                        - Type
- 
            
    array 
 Defines one or more email attachments to be sent to the buyer. These can be, for example, documents with the general terms and conditions. 
buyer.attachDocuments.<n>
- 
                        - Type
- 
            
    array 
 This needs EXT:cart_pdf to work. Defines one or more email attachments of the generated PDF documents to be sent to the buyer. This can be the order confirmation, the invoice or a separate document. 
seller.attachments.<n>
- 
                        - Type
- 
            
    array 
 Defines one or more email attachments to be sent to the seller. These can be, for example, documents with the general terms and conditions. 
seller.attachDocuments.<n>
- 
                        - Type
- 
            
    array 
 This needs EXT:cart_pdf to work. Defines one or more email attachments of the generated PDF documents to be sent to the seller. This can be the order confirmation, the invoice or a separate document.