Why Every Forex Broker Needs a Dedicated PSP Payment Solution: Integration Design
Payments are asynchronous and failure-prone. A dedicated PSP integration for brokers is as much a design problem as a commercial one. This guide covers the design elements that matter.
Why a dedicated provider
Providers that accept forex and CFD flow and understand broker requirements reduce acceptance risk and onboarding friction. Confirm acceptance conditions and notice periods in writing.
State model
Define states for deposits and withdrawals: initiated, pending, approved, completed, failed and reversed, with permitted transitions and manual review steps. See our gateway integration page.
Callbacks and idempotency
Verify signatures, handle duplicates and out-of-order callbacks and credit exactly once. Log every callback with its processing result.
Reconciliation
Run daily jobs matching provider reports to CRM and platform balances and send exceptions to a queue with an owner.
Multi-provider design
Abstract providers behind a common interface so a second provider can be added or switched without a rebuild. Define failover and client messaging. See our PSP page and the provider evaluation guide.
Monitoring signals
- Approval rate and decline reasons.
- Callback latency and failure rate.
- Settlement delays.
- Chargeback rate.
- Unreconciled transaction count.
Alert on thresholds and review monthly with the provider.
Payment state model
Model each payment as a state machine: initiated, pending, authorised, captured or settled, failed, reversed, refunded, disputed. Define allowed transitions, the actor or callback that triggers each, and the CRM and platform effects (balance operation only on settled). Make illegal transitions impossible in code.
A clear state model prevents the most expensive class of bug: crediting a balance before funds are final.
Callbacks and idempotency
Provider callbacks are asynchronous and may be duplicated, delayed or out of order. Authenticate them (signature, source), deduplicate by provider reference, and make processing idempotent. Store the raw callback for audit. Run a periodic status pull for payments that remain pending beyond a threshold.
Test with replayed, duplicated and reordered callbacks and verify exactly one balance operation per settled payment.
Reconciliation design
| Check | Sources | Key | Frequency |
|---|---|---|---|
| Provider vs CRM transactions | Settlement file and CRM | Provider reference | Daily |
| CRM vs platform credits | CRM ledger and balance operations | Internal reference | Daily |
| Fees | Provider statement and expected fees | Transaction | Monthly |
| Chargebacks | Provider and CRM | Case ID | As received |
Classify differences (timing, missing, duplicate, amount) and track age.
Multi-provider design and monitoring
Abstract providers behind an internal interface with routing rules by country, method and cost, and failover when approval rate or latency degrades. Monitor approval rate, decline reasons, callback latency, settlement delay and chargeback rate with alerts.
See our payment provider page for integration options.
Worked example: a stuck pending payment
A deposit remains pending for two hours. The status pull job detects that no callback arrived, queries the provider, finds the payment settled and processes it through the same idempotent path. The CRM credits once and the log links callback absence to the pull.
Monitor the count and age of pending payments, and alert when thresholds are exceeded.
Fraud and risk signals
Define signals: multiple payment methods in short intervals, mismatched names, rapid deposit and withdrawal and unusual geography. Route flagged items to review with documented criteria and keep records for compliance.
Provider onboarding and testing plan
Prepare an onboarding plan: documentation pack, sandbox access, test case list (success, decline, 3-D Secure paths where relevant, refund, chargeback notification), certification steps and go-live checklist. Assign owners and track provider responses.
Keep test evidence for each case and store it with the provider documentation.
Frequently asked questions
Why model payments as states?
To prevent crediting balances before funds are final and to make behaviour testable.
How should callbacks be processed?
Authenticated, deduplicated, idempotent and stored, with a status pull for stuck items.
What should reconciliation cover?
Provider to CRM, CRM to platform, fees and chargebacks.
Why use multiple providers?
For resilience and routing flexibility, at the cost of integration complexity.