You will get Payment Integration (Gateway / Tokenization)
Project details
I implement secure integrations with payment providers, with attention to idempotency, webhook verification, tokenization and retry policies. Included: integration tests in sandbox and a checklist for production rollout.
Programming Languages
C#What's included
| Service Tiers |
Starter
$200
|
Standard
$400
|
Advanced
$800
|
|---|---|---|---|
| Delivery Time | 5 days | 7 days | 12 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
About Regina
Software Architect & Senior .NET Engineer | APIs, Integrations
Blumenau, Brazil - 8:25 pm local time
My background includes enterprise software, HR platforms, compliance systems, Brazilian electronic documents (NF-e, NFS-e, CT-e, eSocial), and experience in fintech and payments.
I help companies solve complex engineering problems such as:
• API design and backend development in .NET
• Integrations with external services (payments, fiscal, compliance)
• Performance troubleshooting and bottleneck analysis
• Architecture for scalable and reliable systems
• Payment-related workflows (acquirers, Apple Pay, Google Pay)
• Distributed systems debugging
• Refactoring legacy systems into maintainable, stable structures
What I bring:
• 13+ years delivering large-scale and mission-critical systems
• Strong architecture and system design background
• Clear communication and precise scoping
• Fast onboarding and low management overhead
• Clean, maintainable, production-ready code
• Reliable delivery and focus on long-term quality
Available for:
• API development
• Integration projects
• Technical troubleshooting
• Architecture sessions
• Performance analysis
• Short consulting work
Let me know your challeng, I can start with a small milestone so you can validate my work immediately.
Steps for completing your project
After purchasing the project, send requirements so Regina can start the project.
Delivery time starts when Regina receives requirements from you.
Regina works on your project following the steps below.
Revisions may occur after the delivery date.
Setup & Flow Mapping (1–2 days)
- Client provides gateway documentation and sandbox credentials - I map the payment flows (charge, webhook, tokenization) - We finalize approved flow diagrams
Integration Development (3–8 days)
- Payment request implementation - Webhook listener with signature validation - Idempotency + retry logic - Tokenization flow (if included in package) - Sandbox testing with real cases