# additional information

- [Smart contracts](https://docs.quadrata.com/integration/additional-information/smart-contracts.md): Smart contracts are implemented with OpenZeppelin Upgrade - this means that the underlying function can be modified for future functionality and optimizations.
- [Quadrata Sandbox](https://docs.quadrata.com/integration/additional-information/quadrata-sandbox.md): Learn how to use Quadrata's passport issuer sandbox to mint passports and modify their attribute values.
- [Passport Issuers](https://docs.quadrata.com/integration/additional-information/passport-issuers.md)
- [Privileged Roles & Ownership](https://docs.quadrata.com/integration/additional-information/privileged-roles-and-ownership.md)
- [Constants](https://docs.quadrata.com/integration/additional-information/constants.md)
- [Flex Kit Attributes](https://docs.quadrata.com/integration/additional-information/flex-kit-attributes.md)
- [Smart Contract Addresses](https://docs.quadrata.com/integration/additional-information/flex-kit-attributes/smart-contract-addresses.md)


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