A unified Web3 platform rollout is a sequence of dependency changes, each with stored state and failure conditions. Replace the most observable and reversible interfaces first, then migrate event and payment workflows with explicit reconciliation gates. The reference architecture explains the service layers; this guide is a phased implementation plan.
Inventory interfaces and application state
List RPC clients, indexed APIs, event subscriptions, payment integrations and risk-screening calls. For each, record authentication, required methods, limits, stored cursors and in-flight state. Shared account access does not mean the interfaces have the same coverage or semantics. Assign an owner and an acceptance test to every dependency.
Migrate read-only requests first
Build sanitized fixtures and query both setups at a common network and block. Compare response shape, errors, freshness and historical depth. Roll out the new configuration gradually while retaining the prior endpoint as a controlled rollback option. Keep provider-specific indexed APIs separate from standard RPC URL changes.
Replay event consumers from a verified cursor
Preserve the last fully processed position and start the replacement with a bounded overlap. Deduplicate deliveries and chain observations according to their respective identifiers. Rebuild a sample of derived application state from source events. Confirm replay retention and an RPC backfill path before relying on a live subscription alone.
Reconcile payment state before switching the workflow
Identify open orders, pending submissions and transfers with unknown outcomes. Preserve original transaction hashes and correlate them with application orders. Keep one controlled write path during cutover. A timeout is not proof of failure, and switching services does not justify creating a fresh transfer without checking the original one.
Validate screening decisions independently
Risk APIs can use different categories and scales. Run a representative case set, compare explanations and have an accountable reviewer resolve changed decisions. Retain previous evidence and policy versions. Do not copy numerical thresholds into a new service without testing their meaning and operational impact.
Close each phase with evidence and rollback ownership
Use separate gates for method support, data freshness, replay completeness, order reconciliation and usage accounting. Record gaps and decide whether to continue, repair or roll back. Retire old credentials only after the corresponding interface has passed its gate. The RPC directory, Event Streams and Processing API should be checked as distinct service scopes.
Frequently Asked Questions
Which integration should move first?
Choose a reversible, observable dependency such as a read-only RPC workload. Its results can be compared before the new path controls application state or submits transactions.
Does one account make all services interchangeable?
No. Coverage, payloads, limits and state models may differ by interface and network. Validate each required service independently.
When should the old stack be retired?
After in-flight states and historical gaps are reconciled, acceptance gates pass and rollback ownership is clear. Handle retired credentials through the normal secret-management process.