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Fiverr Pro
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$
USD
I will harden one PHP or dotnet payment webhook against duplicate events
Ekin Y.
About this gig
Payment providers retry webhook deliveries. Your application needs a rule for processing the same event again.
I will harden one existing PHP/Laravel or C#/.NET payment webhook for one agreed duplicate-processing issue. Scope is one provider, one event type and one handler, up to five relevant source files and 500 lines in total, using an existing database and test environment.
You receive a focused patch, tests or repeatable fixtures for first delivery and duplicate delivery, and a short explanation of the event key, processing guard and assumptions. Any locking, uniqueness constraint or state transition is agreed before work starts.
Message me before ordering with sanitized code, provider docs and a reproducible test case. I confirm that the issue fits this package. One revision corrects the agreed duplicate-event behavior.
New gateway integrations, full payment audits, live transactions, production access, real card/customer data, major database changes and security/compliance certification are excluded. Provider behavior and infrastructure can affect reliability; no universal exactly-once guarantee is claimed. All communication stays on Fiverr.
Get to know Ekin Y.
Ekin Y.
Backend Reviews and Architecture Assessments
- FromUnited States
- Member sinceOct 2026
- Avg. response time9 hours
Languages
Turkish, English
I help founders and engineering teams understand backend problems and decide what to improve next. My work includes codebase assessment, architecture review and production-readiness analysis. I use AI-assisted exploration with manual source-code checks and distinguish supported findings from questions that need further validation. Each engagement has a defined scope, clear deliverables and practical next steps.
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FAQ
Which technologies and payment providers are supported?
This package is for an existing PHP/Laravel or C#/.NET backend. Send the provider's webhook documentation and sanitized code first. Provider-specific feasibility is confirmed before ordering; support for every gateway is not assumed.
Will you access my live payment account?
No. Work uses sanitized source, test fixtures and an agreed local or sandbox environment. Do not send live secret keys, card data, bank access or customer records. Live charges and production deployment are excluded.
Do you guarantee exactly-once processing?
No universal exactly-once guarantee is made. I implement and validate the agreed duplicate-event control within the supplied code and test environment, documenting assumptions about event identity, database constraints and provider retries.
What if the handler needs a larger redesign?
We scope the issue before ordering. New integrations, broad refactoring, major schema changes, multiple handlers or event types, and unrelated payment failures require a separate agreement.
