> For the complete documentation index, see [llms.txt](https://legacy-docs.usesmileid.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://legacy-docs.usesmileid.com/further-reading/faqs/what-are-top-level-keys.md).
# What are top-level keys?
Due to discrepancies of keys returned from our providers, we have filtered and standardised the JSON top-level keys below to simplify the use of our JSON response across all our supported ID types.
| Key | Description | Example |
| ---------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------- |
| Country | Country where ID was issued | "NG" |
| IDType | The type of ID that was issued | "DRIVERS\_LICENSE" |
| IDNumber | The ID number that was looked up in the ID authority database | "ABC000000000" |
| SecondaryIDNumber | Another ID number that is tied to another ID type ( different from the ID type been looked up) e.g. SA Passport also has the SA National ID printed on the data page. | "000000000" |
| ExpirationDate | Expiration date of the ID card (when applicable) | "2021-08-15" |
| IssuanceDate | Issuance date of the ID card
(when applicable)
| "2000-03-20" |
| FullName | Full name of ID owner | "Leo Doe Joe" |
| DOB | Date of birth of ID owner | "2000-09-20" |
| Photo | Photo of ID owner on file in the ID authority database | `Base64 Encoded String` |
| PhoneNumber | Phone number of ID owner | "12345678900" |
| PhoneNumber2 | Second phone number of ID owner (when available) | "Not Available" |
| Document | Photo of ID card on file in the ID authority database (when applicable) | "Not Available" |
| Gender | Gender of ID owner | "Male" |
| Address | Address of ID owner
NOTE: this might not be the current address of the ID owner
| "10, Workbox, Ojora Close, Victoria Island, Lagos State" |
| IDNumberPreviouslyRegistered | Boolean value that informs you if ID info has previously been used successfully to register a user.
Only available on Biometric KYC product.
| \ |
| UserIDsOfPreviousRegistrants | Registered User IDs that have previously used the ID info you just queried.
Only available on Enhanced KYC + SmartSelfie™ product.
| \["12134","23456"] |
---
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