# Column Documentation > Column N.A. is the first nationally chartered bank created to serve developers and builders, offering financial capabilities in a developer first way. Every page is available as clean Markdown by appending `.md` to its path under https://docs.column.com/markdown/. The complete documentation is also available as a single file at https://docs.column.com/llms-full.txt. The API is also described by an OpenAPI 3.1 document at https://docs.column.com/openapi.yaml (JSON: https://docs.column.com/openapi.json). ## Guides - [Guides](https://docs.column.com/markdown/guides.md): Dive into the core concepts and integrate specific features. ### Common workflows - [Book Transfers and Holds](https://docs.column.com/markdown/guides/book-transfers-and-holds.md) - [Overdrafts](https://docs.column.com/markdown/guides/overdrafts.md) - [Two Legged Transactions](https://docs.column.com/markdown/guides/two-legged-transactions.md) - [Going live](https://docs.column.com/markdown/guides/going-live.md) ### Technical guides - [Getting Started](https://docs.column.com/markdown/guides/getting-started.md) - [Sandbox and Testing](https://docs.column.com/markdown/guides/sandbox-and-testing.md) - [Reporting](https://docs.column.com/markdown/guides/reporting.md) - [KYC/KYB Verifications](https://docs.column.com/markdown/guides/kyc-kyb.md) ### Use cases - [Payment Origination](https://docs.column.com/markdown/guides/payment-origination.md) - [Bank Accounts](https://docs.column.com/markdown/guides/bank-accounts.md) - [Card Programs](https://docs.column.com/markdown/guides/card-programs.md) - [Loan Origination](https://docs.column.com/markdown/guides/loan-origination.md) ### Informational guides - [Intro to Card Issuing](https://docs.column.com/markdown/guides/intro-to-card-issuing.md) - [Roles & Permissions](https://docs.column.com/markdown/guides/roles-and-permissions.md) - [API Key Security](https://docs.column.com/markdown/guides/api-key-security.md) - [Bank Statements](https://docs.column.com/markdown/guides/statements.md) - [Common Workflows](https://docs.column.com/markdown/guides/common-workflows.md): End-to-end implementation recipes for the most common Column integration patterns. ## Working with the API - [Authentication](https://docs.column.com/markdown/working-with-the-api/authentication.md) - [Pagination](https://docs.column.com/markdown/working-with-the-api/pagination.md) - [Idempotency](https://docs.column.com/markdown/working-with-the-api/idempotency.md) - [Errors](https://docs.column.com/markdown/working-with-the-api/errors.md) - [Events and Webhooks](https://docs.column.com/markdown/working-with-the-api/events-and-webhooks.md) ## Data Models - [Platform](https://docs.column.com/markdown/data-models/platform.md) - [Entity](https://docs.column.com/markdown/data-models/entity.md) - [Bank Account](https://docs.column.com/markdown/data-models/account.md) - [Account Number](https://docs.column.com/markdown/data-models/account-number.md) - [Counterparty](https://docs.column.com/markdown/data-models/counterparty.md) - [Transfer](https://docs.column.com/markdown/data-models/transfer.md) - [Events and Webhooks](https://docs.column.com/markdown/data-models/events-and-webhooks.md) ## Entities - [Entities](https://docs.column.com/markdown/entities.md) - [Managing Entities](https://docs.column.com/markdown/entities/managing-entities.md) - [Documentary Evidence](https://docs.column.com/markdown/entities/documentary-evidence.md) ## ACH - [ACH](https://docs.column.com/markdown/ach.md) - [Types](https://docs.column.com/markdown/ach/types.md) - [Timing](https://docs.column.com/markdown/ach/timing.md) - [Notifications and States](https://docs.column.com/markdown/ach/notifications-and-states.md) - [Returns](https://docs.column.com/markdown/ach/returns.md) - [Reversals](https://docs.column.com/markdown/ach/reversals.md) - [International ACH Transfers](https://docs.column.com/markdown/ach/iat.md) ## Domestic Wire - [Wire](https://docs.column.com/markdown/wire.md) - [Notifications and States](https://docs.column.com/markdown/wire/notifications-and-states.md) - [Reversals](https://docs.column.com/markdown/wire/reversals.md) - [Return Requests](https://docs.column.com/markdown/wire/return-requests.md) - [Wire Drawdown Requests](https://docs.column.com/markdown/wire/wire-drawdown-requests.md) ## International Wires - [International Wires](https://docs.column.com/markdown/international-wires.md) - [Outgoing Transfers](https://docs.column.com/markdown/international-wires/outgoing-transfers.md) - [Incoming Transfers](https://docs.column.com/markdown/international-wires/incoming-transfers.md) - [Notifications and States](https://docs.column.com/markdown/international-wires/notifications-and-states.md) - [Transfer Fees](https://docs.column.com/markdown/international-wires/transfer-fees.md) - [Returns](https://docs.column.com/markdown/international-wires/returns.md) - [Cancellations](https://docs.column.com/markdown/international-wires/cancellations.md) - [Tracking](https://docs.column.com/markdown/international-wires/tracking.md) - [Supported Currencies](https://docs.column.com/markdown/international-wires/supported-currencies.md) - [Country-Specific Details](https://docs.column.com/markdown/international-wires/country-specific-details.md) - [Sandbox Simulations](https://docs.column.com/markdown/international-wires/simulation.md) ## Realtime Payments - [Realtime](https://docs.column.com/markdown/realtime.md) - [Outgoing Realtime Transfers](https://docs.column.com/markdown/realtime/outgoing-transfers.md) - [Incoming Realtime Transfers](https://docs.column.com/markdown/realtime/incoming-transfers.md) - [Realtime Returns](https://docs.column.com/markdown/realtime/returns.md) - [Notifications and States](https://docs.column.com/markdown/realtime/notifications-and-states.md) - [Request For Payment (RFP)](https://docs.column.com/markdown/realtime/request-for-payment.md) ## Checks - [Checks](https://docs.column.com/markdown/checks.md) - [Check Issuing, Printing, and Mailing](https://docs.column.com/markdown/checks/issuing.md) - [Check Deposits](https://docs.column.com/markdown/checks/deposits.md) - [Lockboxes](https://docs.column.com/markdown/checks/lockboxes.md) - [Notifications and States](https://docs.column.com/markdown/checks/notifications-and-states.md) - [Returns](https://docs.column.com/markdown/checks/returns.md) ## Loans - [Loans](https://docs.column.com/markdown/lending.md) - [Loan Disbursements](https://docs.column.com/markdown/lending/disbursement.md) - [Loan Payments](https://docs.column.com/markdown/lending/payment.md) - [Loan Reports](https://docs.column.com/markdown/lending/report.md) ## API Reference - [API Reference](https://docs.column.com/markdown/api.md): Complete API reference for all Column endpoints, organized by resource type. - [Entity](https://docs.column.com/markdown/api/entity.md) - [Bank Account](https://docs.column.com/markdown/api/bank-account.md) - [Account Number](https://docs.column.com/markdown/api/account-number.md) - [Loans](https://docs.column.com/markdown/api/lending.md) - [Counterparty](https://docs.column.com/markdown/api/counterparty.md) - [ACH Transfer](https://docs.column.com/markdown/api/ach-transfer.md) - [ACH Positive Pay](https://docs.column.com/markdown/api/ach-positive-pay.md) - [Book Transfer](https://docs.column.com/markdown/api/book-transfer.md) - [Wire Transfer](https://docs.column.com/markdown/api/wire-transfer.md) - [International Wire](https://docs.column.com/markdown/api/international-wire.md) - [Realtime Transfer](https://docs.column.com/markdown/api/realtime-transfer.md) - [Check Transfer](https://docs.column.com/markdown/api/check-transfer.md) - [Transfer](https://docs.column.com/markdown/api/transfer.md) - [Simulation](https://docs.column.com/markdown/api/simulation.md) - [Events](https://docs.column.com/markdown/api/events.md) - [Reporting](https://docs.column.com/markdown/api/reporting.md) - [Webhooks](https://docs.column.com/markdown/api/webhooks.md) - [Documents](https://docs.column.com/markdown/api/documents.md)