Getting Started

Use this section to prepare and sequence a Institutional Crypto Buy/Sell Solution integration within Crypto-As-A-Service (CAAS).

Before you begin

This module uses a server-to-server integration model. Most requests require a userId, which is the customer's Binance sub-account ID created or mapped through the approved CaaS onboarding flow — see CAAS Overview for the account model and KYC SaaS for the customer onboarding flow that produces it.

Two things must be in place before you call anything:

• A CAAS account with this module enabled by the Link team. It is enabled per partner, on top of your CAAS integration.
• The customer's sub-account KYC passed through KYC SaaS. A sub-account cannot trade until its KYC has passed, so Buy and Sell will not work for that customer before then.

Recommended integration order

1. Complete CAAS onboarding.

2. Confirm the institutional account structure and customer userId lifecycle.

3. Agree the fiat fund flow, settlement model, supported currencies/assets, limits, and spread configuration.

4. Apply for Developer's Account, exchange public keys, configure API credentials, and allowlist server IP addresses.

5. Implement request signing and verify a discovery endpoint in QA.

6. Implement the required Buy and/or Sell flow.

7. Implement the required partner-hosted fiat confirmation, refund, and payout APIs.

8. Implement webhook signature verification and transaction-status recovery by polling.

9. Complete negative-path testing, reconciliation validation, operational readiness, and production approval.