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$
USD
I will integrate third party apis and payment systems in golang
Yusuf Dariyemez
About this gig
Need to connect your Go backend to a third-party API, webhook provider, or payment system?
I am a Senior Software Engineer with 6 years of experience building production integrations, payment workflows, and event-driven backend systems in Go.
I can help with:
REST API and SDK integrations
Payment providers and checkout workflows
Secure webhook processing and signature verification
Idempotency and duplicate event protection
OAuth2, API key, JWT, and bearer token authentication
PostgreSQL and MongoDB persistence
Retry logic, error handling, and transaction logging
Email, SMS, storage, accounting, and CRM integrations
Unit and integration tests
OpenAPI documentation and Docker setup
I focus on secure implementation, maintainable code, predictable failure handling, and clear documentation.
Please message me before ordering with the provider documentation and required workflow. Subscriptions, split payments, refunds, marketplaces, multiple providers, or complex financial flows require a custom offer.
Get to know Yusuf Dariyemez
Yusuf Dariyemez
Senior Go Backend Developer APIs Microservices PostgreSQL
- FromTurkey
- Member sinceMar 2023
Languages
English, Turkish
Hi, I'm Yusuf, a Senior Software Engineer with 6 years of experience building scalable backend systems and enterprise applications. I specialize in Go, REST APIs, microservices, PostgreSQL, MongoDB, Kafka, Redis, Docker, and Kubernetes. I can build backend applications from scratch, integrate third-party APIs and payment systems, fix bugs, optimize performance, and improve existing Go projects. I deliver clean, maintainable, production-ready code with clear communication and reliable delivery.
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FAQ
OAuth2 authorization and token refresh flow.
Yes. Please send the provider name, API documentation, required operations, authentication method, and expected workflow. I will review the scope and recommend the correct package.
Which APIs can you integrate?
I can integrate most documented REST APIs and webhook-based services, including payment providers, CRM systems, accounting tools, email, SMS, storage, authentication, logistics, and notification services.
Can you integrate Stripe or another payment provider?
Yes. I can implement backend payment creation, secure webhook handling, signature verification, idempotency, payment status persistence, error handling, and tests for supported providers.
Do you support webhooks?
Yes. I can build webhook endpoints, verify provider signatures, prevent duplicate event processing, store event records, handle retries safely, and update application state.
Can you implement OAuth2 authentication?
Yes. I can implement authorization code flows, token storage, token refresh, expiration handling, and authenticated API requests when the provider documentation supports them.
Does the payment package include subscriptions?
No. The listed Premium package covers one provider and one basic payment flow. Subscriptions, recurring billing, dunning, plan management, and renewal workflows require a custom offer.
Does the payment package include refunds and disputes?
Refunds, partial refunds, disputes, chargebacks, and reconciliation are not included by default. They can be added after the required workflows and provider capabilities are reviewed.
Will you need access to my API credentials?
Testing usually requires temporary sandbox credentials with minimum permissions. Please never send permanent production passwords. Production secrets should be configured securely by the account owner.
Do you provide tests and documentation?
Yes. Standard and Premium packages include appropriate automated tests and technical documentation. Additional coverage or detailed documentation can also be ordered separately.
Can you work on my existing Go project?
Yes. I can follow the existing framework, architecture, database conventions, error handling, logging, testing approach, and deployment setup used by your project.
