# API Reference

- [General](/api/certn-api-v-1.0/api-reference/general.md): How to organize the Teams functionality in Certn's API Reference Guide.
- [Human Resources](/api/certn-api-v-1.0/api-reference/hr.md): How to make requests and generate reports as a human resources client in the Certn API.
- [Available checks](/api/certn-api-v-1.0/api-reference/hr/available-checks.md)
- [Property Management](/api/certn-api-v-1.0/api-reference/pm.md): How to make requests and generate reports as a property management client in the Certn API.
- [Available checks](/api/certn-api-v-1.0/api-reference/pm/available-checks.md)
- [Resources](/api/certn-api-v-1.0/api-reference/resources.md): Resource articles about Certn API application parameters, regional codes, error codes, and report field mappings.
- [Application parameters](/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](/api/certn-api-v-1.0/api-reference/resources/application-parameters/request-flags.md)
- [Error codes](/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](/api/certn-api-v-1.0/api-reference/resources/region-codes.md)
- [Report field mappings](/api/certn-api-v-1.0/api-reference/resources/report-field-mappings.md)