# Resources

- [Application parameters](https://docs.certn.co/api/certn-api-v-1.0/api-reference/resources/application-parameters.md): Certn API parameters for how to request checks, collect information and generate reports.
- [Request flags](https://docs.certn.co/api/certn-api-v-1.0/api-reference/resources/application-parameters/request-flags.md)
- [Error codes](https://docs.certn.co/api/certn-api-v-1.0/api-reference/resources/error-codes.md): A list of API error codes and how to fix them.
- [Regional codes](https://docs.certn.co/api/certn-api-v-1.0/api-reference/resources/region-codes.md)
- [Report field mappings](https://docs.certn.co/api/certn-api-v-1.0/api-reference/resources/report-field-mappings.md)


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