To keep all contract-related documents together, you can upload and download files to contracts using any Files endpoint. Thus, each contract can contain several files: the contract itself (always), the contract verification file (if all participants have already signed the contract), and other attachments (optional).

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You can download these files either as one document using the contract file type or as separate files using the corresponding file type id.

Contract file attributes

Attribute	Type	Description
_links	object	Contains links to endpoints associated with the parent object. See Links.
extension	string(enum)	Indicates the attached file extension (see Attachments). See also, Contract file extensions.
id	integer(signed_integer_id)	The ID of the contract file.
name	string	If the file name contains only non-US-ASCII characters, the default filename will be generated as `type_id.extension`. For example, a file named `*-+%&.png` will be changed to `attachment_123.png`, where `123` is the value of the `id` attribute.
type	string(enum)	The type of the contract file. See Contract file types.

Contract file extensions

Currently, The following file extensions are allowed: ASICE, BMP, CSV, DOC, DOCX, DOTX, GIF, JPEG, JPG, KEY, NUMBERS, ODS, PAGES, PDF, PNG, PPSX, PPT, PPTX, RTF, TIF, TIFF, TXT, XLS, XLSB, XLSM, XLSX, XML.

Contract file types

The following table shows the file types allowed for contracts:

File type	Description
contract	The actual contract file that can be download in PDF format. The `contract` file `id` is always `1`, and the file `extension` is always `pdf`.
verification	The contract verification information file is available only after the contract is signed. The `verification` file `id` is always `2`, and the file `extension` is always `pdf`.
pdf	The file uploaded to the contract as the `expanded_pdf` file type (see the Create a contract with a PDF) is automatically saved in the contract as the `pdf` type. The `pdf` file `id` is generated automatically when you save the file; the file `extension` is always `pdf`.
attachment	The file uploaded to the contract as an `attachment`. The `attachment` file `id` is generated automatically when you save the file; the file `extension` can be of any type listed in the Contract file extensions.