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.