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Most integrations start with a verification. Checks, webhooks, and ABA checks build around that record.

Organization

The tenant boundary for API keys, verifications, checks, webhooks, and ABA checks.

Verification

A point-in-time record of business identity, contact identity, and bank account details.

Check

A later comparison against a verification fingerprint.

Webhooks

Subscriptions and events that tell your app when verification outcomes change.

ABA check

A payment file review that compares ABA entries against existing verifications.

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The usual sequence

First, create a verification for the payee you want to trust. Then receive the completion result through a webhook. Store the verification ID against your own record. Later, run checks before payment or when saved details change. ABA file checks build on the same idea at file level: upload an ABA file, match its entries to existing successful verifications, and download a regenerated file containing matched entries.