Custom posting rules, routing logic, and fee policies that survive every platform update — guaranteed.
Before/after hooks around every posting step, policy-driven overrides, and versioned extensions ensure your custom payment logic stays safe through platform upgrades — because in payments, a posting error isn't a bug, it's a financial control failure.
The Problem This Solves
Before PaymentHub
Custom payment posting logic becomes untouchable code. Teams avoid platform upgrades because custom GL mapping, entity-specific fee rules, and routing configurations might break. When upgrades do happen, they require weeks of regression testing and manual validation. Security patches and new features can't deploy safely when every upgrade risks breaking the posting rules that keep the books correct. The result: organizations run outdated platform versions with known security gaps because the risk of upgrading exceeds the risk of staying put.
With PaymentHub
Custom posting rules, fee policies, and routing logic are isolated in versioned extensions that are tested independently of the platform core. Upgrades deploy automatically without affecting custom logic. Every extension execution is logged with input, output, and decision for audit compliance. New platform features and security patches are available immediately without the upgrade fear that blocks most payment platform improvements.
How It Works
Before/After Hooks on Every Payment Step
Insert custom logic before and after the critical steps in the payment lifecycle: payment validation, gateway routing, fee evaluation, authorization, capture, posting, and ERP synchronization. A before-posting hook might apply entity-specific GL account overrides, validate that the target GL account is active, or split a surcharge amount to a separate revenue account. An after-posting hook might trigger a notification to the controller, update a custom reporting table, or sync the posting to a secondary system. Hooks are typed, scoped to specific payment steps, and executed within the same transaction boundary as the core operation — ensuring atomicity. If a hook fails, the entire step rolls back cleanly.
Policy-Driven Overrides
Override platform behavior through configurable policies rather than code changes. Approval policies define who must approve what under which conditions. Fee policies determine surcharge, convenience fee, and incentive application rules. Routing policies control gateway selection logic. Posting policies specify GL mapping, entity assignment, and journal entry format. Policies are evaluated at runtime against the current transaction context, and the applicable policy determines the behavior. Policy changes take effect immediately without deployment, and policy history is versioned for audit purposes. This approach makes business rule changes a configuration activity rather than a development project.
Versioned Extensions
Extensions (hooks and policies) are versioned independently of the platform. Each extension has a version number, a compatibility range (which platform versions it supports), a test suite, and an execution log. When the platform upgrades, the extension system validates that all active extensions are compatible with the new version before the upgrade proceeds. If an incompatibility is detected, the upgrade is paused and the operations team is notified with specific guidance on which extensions need attention. Extensions can be developed, tested, and deployed through a standard CI/CD workflow with staging validation before production deployment.
Full Audit Trail
Every extension execution is logged with the complete context: which hook or policy executed, the input data, the decision made, the output data, and the execution time. This audit trail provides the compliance documentation that controllers and auditors require for custom posting logic — demonstrating that every GL entry was produced by a defined, tested, and authorized rule. The audit trail is queryable and exportable, enabling investigation of any posting question by tracing the exact sequence of hooks and policies that produced the result.
Architecture & Integration Notes
The extension architecture uses a middleware pipeline pattern. Each payment lifecycle step (validation, routing, fee evaluation, authorization, capture, posting, sync) has a defined extension point where before/after hooks can be registered. Hooks execute in registered order within the same transaction boundary as the core operation. Policy overrides are evaluated before the core operation to determine the runtime behavior. The extension runtime is sandboxed — a failing extension cannot corrupt the core payment pipeline, only pause its own step for review. Extension packages are distributed as versioned modules with type definitions, test fixtures, and compatibility metadata.
AI Copilot for Upgrade-Safe Customization
The AI copilot generates posting rule extensions from natural language descriptions of business requirements. Describe "split surcharge revenue to GL account 4500 for Entity A and 4510 for Entity B" and the copilot generates the typed hook implementation, test cases, and compatibility validation. It reviews existing extensions for potential conflicts with new rules, generates comprehensive test scenarios (partial payments, multi-entity, credit memos, surcharge splits), and validates that extension output produces correct GL entries against sample data. For platform upgrades, the copilot reviews all active extensions against the new version's changes and flags any compatibility concerns.
AI Copilot — Available on Growth & Enterprise Plans
AI Copilot reduces implementation time for upgrade-safe customization by automatically generating field mappings, test datasets, and validation scripts based on your ERP schema — so your team can ship faster without writing repetitive configuration code.
Ready to see Upgrade-Safe Customization in action?
Book a Payments Blueprint call and get a live walkthrough tailored to your ERP and payment requirements.
Before & After PaymentHub
| Area | Before | After PaymentHub |
|---|---|---|
| Area 1 | Avoided for months or years because custom logic might break | Deploy immediately — extensions are tested and validated automatically |
| Area 2 | Hard-coded modifications that require developer involvement to change | Configurable hooks and policies managed through admin interface or CI/CD |
| Area 3 | Custom code reviewed manually with no execution logging | Every extension execution logged with full input/output/decision trail |
| Area 4 | Development sprint to modify fee, routing, or approval rules | Policy changes take effect immediately through configuration — no deployment |
Related Features
Automated Reconciliation
Match payments to invoices at the line-item level using AI-powered matching, apply entity-specific posting rules, and route exceptions to a prioritized queue — from 40+ hours of manual reconciliation to under 4 hours monthly.
Gateway Routing Engine
PaymentHub's gateway orchestration routes payments to any processor based on configurable business rules, supports automatic failover, and lets you add or swap gateways without disrupting ERP posting workflows.
Surcharge Engine
PaymentHub's surcharge engine manages compliant surcharging and convenience fees with entity-specific rules, state-level compliance, card brand adherence, and designated GL posting — recovering processing costs without legal or customer relationship risk.
Frequently Asked Questions — Upgrade-Safe Customization
Get your tailored implementation plan.
Our Payments Blueprint call delivers a written implementation roadmap specific to your ERP, your team, and your timeline.