PrestaShop 9 Compatibility
Know what will break before a store migration.
We inspect modules, checkout behavior, overrides, hooks, and theme output in a safe PrestaShop 9 sandbox, then return a practical keep, patch, or replace map.
What we check first.
Checkout and payment pathsAnything that can block orders, redirects, tax, carriers, or customer data.
Overrides and hooksLegacy customization points that can collide with newer core behavior.
Theme outputFrontend blocks, forms, buttons, and templates that may not survive a theme change.
What you receive.
Risk mapClear severity by module area, not a vague “maybe incompatible” warning.
Patch planFiles, surfaces, and tests that should be touched before production.
Replacement logicWhen buying a new module is smarter than repairing an old one.
When is this audit worth buying? Not every migration needs a paid module audit. It makes sense when the module controls revenue, customer data, checkout, or custom business behavior. View technical details
Strong candidates
- Payment, checkout, carrier, tax, ERP, CRM, and order modules.
- Custom modules with unknown ownership or old overrides.
- Stores where “replace the module” would lose special business behavior.
- Agencies that need a second technical eye before migration work.
Weak candidates
- Simple decorative modules that can be replaced cheaply.
- Old modules with no valuable settings or custom logic.
- Stores where the owner is already rebuilding everything from scratch.
- Cases where no one can provide module files or a test target.
What is inspected technically? The audit focuses on migration failure surfaces rather than generic source-code criticism. View technical details
Compatibility surfaces
Common checks include PHP compatibility, install/upgrade SQL, hooks, controllers, overrides, templates, admin routes, checkout behavior, payment callbacks, and frontend scripts.
PrestaShop 9 audit
module compatibility
PHP 8 compatibility
checkout migration
Safe inputs
A first audit can start from module ZIPs, public repositories, screenshots, error logs, and a staging description. Production admin passwords are not needed for preliminary triage.
module readiness
Hummingbird theme
PrestaShop migration
sandbox testing
Primary validation offer
PrestaShop 9 Compatibility Audit
A fixed-scope module-readiness review before migration breaks checkout pages, custom overrides, admin controllers, hooks, or Hummingbird/theme output.
PS9.1 is Current
Released 2026-03-23 with Hummingbird 2.0 default.
PHP 8.x Pressure
PS9 enforces PHP 8.1+ (supports up to PHP 8.4+) and Symfony 6.4.
Theme Break Risk
Hummingbird completely structures checkout markup, breaking legacy layouts.
Official Market
PrestaShop charges for baseline migration audits, validating this category.
No Production First
Start safely in a read-only local sandbox. No passwords required.
Audit Scope
What the compatibility audit verifies.
The audit does not make blind automated updates. We isolate the module code in a clean PrestaShop 9.1 sandbox to map exact friction points.
Module Surfaces
We trace every integration surface between the module's business logic and the core PrestaShop core database, controllers, and routing mechanisms.
- Symfony routes & legacy Front controllers
- Database install/uninstall/upgrade queries
- Core overrides and bundled vendor assets
- Lifecycle and render Hook handlers
Checkout & Payment Risk
Checkout modules are highly sensitive. A module can install and load without errors, yet completely fail to process orders or calculate tax correctly.
- Cart actions & checkout step overrides
- Payment carrier triggers & redirect states
- Customer address forms & validation rules
- Security tokens and payment verification loops
Hummingbird Theme Output
PrestaShop 9's Hummingbird theme alters template variables and removes legacy scripts. We verify how frontend assets render.
- Smarty template layouts & dynamic blocks
- Bootstrap 5 responsiveness and grid layout
- AJAX buttons, modals, and input event handlers
- Confirmation emails and customer account views
Deliverable Outcome
A complete diagnostic report & path forward.
You receive an expert, clear, actionable document that guides your development team or outlines immediate repairs.
Compatibility & risk map
An exact review of the code's PHP 8.4 compliance, Symfony routing errors, override safety status, and potential hook conflicts.
Tactical patch checklist
Line-by-line file adjustments, staging environment verification checks, and specific advice on complex controller overrides.
Fixed introduction scope
Designed to be highly focused. We review a single checkout engine, one large customized payment integration, or a key shipping handler.
Clear operating safety
No production changes without explicit sandbox approvals, no uncoordinated disclosures, and no fake, automated green-light reports.
Evidence Base
Anonymized findings from real module audits.
Below is a summary of compatibility observations discovered during sandbox tests of checkout modules inside a PrestaShop 9.1.1 + PHP 8.4 + Hummingbird environment.
| Vulnerability Area | Observed Failure | Core Architectural Reason | Audit Remediation Action |
|---|---|---|---|
| Version range declarations | False active compatibility | Declarative headers like ps_versions_compliancy omit PHP 8.4 and Hummingbird dependencies. | Generate isolated run-time test matrices mapping checkout redirect behaviors. |
| Legacy Admin URLs | HTTP 404 error | PS9 replaces legacy controller routing URLs with strict Symfony-registered routes & route token checks. | Audit all admin controller hooks and configuration page action links. |
| Late Hook Timing | Checkout redirect loop | Redirect commands triggered inside late display hooks (e.g. displayHeader) are bypassed by the new cart core. | Trace the full request lifecycle and implement checkout pipeline middleware. |
| Controller Overrides | Module collision | Overrides written for PrestaShop 1.7 clash with PS9 Symfony-injected controllers or other installed plugins. | Identify overridden core classes, check status, and draft standard Symfony event listener paths. |
| Hummingbird Frontend | Broken checkout forms | The default PS9 theme removes legacy jQuery bindings and shifts to Modern CSS grids and standard Bootstrap 5. | Perform visual & functional reviews on address, shipping select, and dynamic payment buttons. |
Engagement Terms
No live production access required.
We believe in diagnostic isolation. All compatibility reviews are carried out in a clean, local staging environment. You do not need to share live system passwords or administrative database access.
- We analyze isolated source files (ZIPs) or public repository branches.
- Initial triage maps risk factors before you pay for code implementation.
- Audit is completely fixed-scope: typical range is $150 - $300 per module.
Protect your migration checkout.
Send us your target module ZIP or redacted file paths. We will conduct a preliminary assessment and return a fixed-price audit scope proposal.