A customer document is a document uploaded by the customer to help prove their identity. Examples include an image (or pdf) of a driver's license, a passport, or some other government-issued ID.

Take me to the Customer Document Endpoint Reference

customerDocument Object

Property	Data Type (length)	Description
`customField1`	string (50)	A property for holding client-defined data. There is no business logic in Helix for a custom field.
`customField2`	string (50)	A property for holding client-defined data. There is no business logic in Helix for a custom field.
`customField3`	string (50)	A property for holding client-defined data. There is no business logic in Helix for a custom field.
`customField4`	string (50)	A property for holding client-defined data. There is no business logic in Helix for a custom field.
`customField5`	string (50)	A property for holding client-defined data. There is no business logic in Helix for a custom field.
`customerId`	integer	The Helix-assigned unique ID for the customer who uploaded the document.
`documentContent`	string (10 MB)	A base64-encoded representation of the actual content of the document. NOTE: Applicable only when calling the /customerDocument/upload route. This property will not be returned by any route. Use RFC 4648-compliant encoding (i.e. no embedded line breaks and `=` as the padding character). See RFC 4648 for more information.
`documentId`	integer	The Helix-assigned unique ID of the document.
`documentName`	string (50)	A caller-specified, user-friendly name for this document. Must have one of the following extensions: - `.jpg` - `.jpeg` - `.gif` - `.png` - `.pdf` - `.heic`(please note that`.heic`files will be converted to`.jpeg` before we store them in helix)
`documentType`	enum	The type of document. Possible values: - `DriversLicense` - `UtilityBill` - `BankStatement` - `NameChangeAffidavit` - `WrittenStatementOfUnauthorizedDebit` - `Unspecified` - `VerificationSummary` - `DisputeDocumentation` - `HoldNotice` - `DriversLicenseBack` - `PassportFront` - `PassportBack` - `UnspecifiedIdCardFront` - `UnspecifiedIdCardBack` - `SelfPortrait` - `DBAStatementOfFiling`* - `FictitiousBusinessName`* - `BusinessLicenseShowingCurrent`* - `AttestationDocument`* - `CertificateOfPartnership`* - `PartnershipAgreement`* - `ProofOfAddress`* - `ArticlesOfOrganization`* - `CertificateOfFormation`* - `CertificateOfOrganization`* - `SecretaryOfStateRegistration`* - `ProofOfGoodStanding`* - `CorporateAuthorization`* - `EINLetter`* - `ArticlesOfIncorporation`* - `Charter`* - `TrustDocuments`* - `CurrentSecretaryOfStateRegistration`* - `CourtDocuments`* - `TrustCertificate`* - `BirthCertificate` - `SocialSecurityCardFront` - `SocialSecurityCardBack` - `SchoolIDFront` - `SchoolIDBack`** Values are only used for business customers *Values are only used for minor customers
`downloadUrl`	deprecated	deprecated
`reasonType`	enum	The reason for uploading the document. Possible values: - `NameChange` - `AddressChange` - `RequestForNewExternalAccount` - `Unspecified` - `ManualReview` - `ReturnOnTransaction` - `VerificationSummary` - `DisputeDocumentation` - `HoldPlaced` - `AutomatedReview` - `Remediation Document`
`tag`	string (50)	A caller-specified unique identifier for this document.