Service
Custom website and application payment integrations
Add payment acceptance to custom websites and applications with server-validated totals, secure callbacks and clear order states.
The problem
Custom apps often calculate prices in the browser, trust redirects as payment proof, or lack idempotent webhook handling.
Who it is for
- • Custom web apps and portals
- • SaaS and booking products
- • Internal business systems that need online payments
What is included
- • Server-side price validation design
- • Checkout session and return handling
- • Webhook verification and idempotency
- • Order / entitlement updates
- • Logging guidance for support
Deliverables
- • Integration code against your stack where agreed
- • Sequence diagrams or flow notes for the payment lifecycle
- • Test matrix for common payment outcomes
How it works
- Step 1
Architecture review
- Step 2
Implementation plan
- Step 3
Build and staging validation
Further steps in a typical engagement: Production support window
Indicative project pricing
From €650.00
Depends on stack (for example Java/Spring Boot, .NET, Node) and existing order model.
- • Indicative unless confirmed as a fixed quote.
- • VAT treatment is confirmed in your quote (shop prices follow site tax settings).
- • Third-party gateway, API or software fees are not included unless stated.
- • Ongoing support is only included when a support package is agreed.
FAQ
Common work includes Java/Spring Boot, .NET, SQL-backed services, REST APIs and webhook-driven systems. Other stacks are assessed case by case.
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Ready to discuss this service?
Share your systems and constraints. You will get a scoped reply—not a pressure pitch.