Blockchain Integration

Overview

Integration can be direct or mediated. A direct integration may run a node, use JSON-RPC, construct transactions, manage keys, and index events. A mediated integration uses a wallet SDK, managed node provider, custodian, or payment gateway.

The required components depend on the use case. Read-only analytics needs reliable queries and indexing. A payment flow needs invoice creation, address or payment-request generation, confirmation monitoring, webhook handling, reconciliation, and refund or payout logic. Smart-contract applications also need ABI handling, gas estimation, transaction signing, and event processing.

Security boundaries should be explicit. Front-end code should not contain merchant API secrets or private keys. Webhooks must be authenticated, duplicate events handled idempotently, and unsupported networks rejected.

A successful integration also covers operations: monitoring, version changes, provider outages, data retention, support tooling, and accounting. Writing one API request is only the beginning of production integration.

A typical integration includes account or address management, invoice creation, transaction monitoring, status updates, webhook processing, refunds or payouts, and accounting exports. The exact design depends on whether the business self-custodies funds or uses a managed payment provider.

Production integrations should use idempotent operations and stable business identifiers. Callbacks can be duplicated or delayed, and chain reorganizations can change previously observed status. Testing should cover wrong networks, underpayments, overpayments, expired invoices, unsupported tokens, fee spikes, and provider outages. Clear separation between blockchain state and order state prevents a technical event from incorrectly completing a business workflow.

A change in token contract, network identifier, or API schema can silently break assumptions. Integration tests should validate real protocol identifiers instead of relying only on asset names or symbols.