> For the complete documentation index, see [llms.txt](https://docs.cleartax.in/cleartax-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master.md).

# Resources and Masters

- [E-Invoice Object](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/e-invoice-object.md)
- [Country Code Master](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/country-code-master.md)
- [State Code Master](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/state-master.md)
- [Pincode Master](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/pincodes.md)
- [Pincode State Mapping Pattern](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/pincode-state-mapping-pattern.md)
- [Port Code Master](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/port-code-master.md)
- [Currency Code Master](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/currency-code-master.md)
- [UQC Master](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/unit-master.md)
- [Tax Rates](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/tax-rates.md)
- [Error Codes](https://docs.cleartax.in/cleartax-docs/e-invoicing-api/e-invoicing-api-reference/resources-and-master/error-codes.md): Listed below are errors that will be returned in response to a Failure.