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Fiverr Pro
English
$
USD
I will build a multi provider API aggregation layer with wallet and session handling
Nasir K
About this gig
Integrating one provider is straightforward. Integrating six, each with its own auth scheme, webhook format and idea of what a completed transaction looks like, is where platforms quietly break.
Balances drift. Callbacks arrive twice. A provider times out mid-transaction and nobody knows if it went through.
That is the problem I solve.
What I build:
- Aggregation layers: many providers behind one clean internal API
- Unified wallet and balance handling, concurrency-safe under load
- Webhook receivers with signature verification, deduplication, idempotency keys and retry with backoff
- Transaction integrity: audit logging and reconciliation against provider records
- Session and state management for real-time systems
- Monitoring and alerting on provider failures
Industries: payment platforms, marketplaces, fintech and real-time gaming. Seamless wallet and player wallet architecture, game provider integration, session management under load, sandbox certification.
10 years as a full-stack engineer. I have integrated a dozen-plus providers into high-concurrency platforms where transaction accuracy was non-negotiable.
Message me with your stack and providers before ordering.
Get to know Nasir K
Nasir K
IoT and Backend Engineer ThingsBoard MQTT Nodejs API Integrations
- FromUnited Arab Emirates
- Member sinceSep 2014
- Last delivery1 year
Languages
English, Urdu
I build systems that move data reliably. IoT telemetry, real time platforms, and multi provider API integrations.
ThingsBoard: setup, deployment, custom dashboards, rule chains, alarms. Device connectivity over MQTT, HTTP, CoAP, Modbus, LoRaWAN. Edge gateways with store and forward.
Backend: Node.js, Python, Laravel, MongoDB, MySQL, REST APIs, microservices, webhook handling, retry logic, idempotency, transaction reconciliation. Infrastructure on AWS and Nginx.
10 years building for clients across UAE and GCC. I scope honestly, document as I build, and hand over systems your team can maintain.
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FAQ
What tech stack do you work with?
Node.js, Python, Laravel and PHP primarily, with MongoDB, MySQL and PostgreSQL. Tell me yours before ordering and I'll confirm fit.
Can you work with a provider whose documentation is poor or incomplete?
Yes — most of them are. Reverse-engineering undocumented behaviour and edge cases is a normal part of this work.
Do you handle the commercial side with the provider?
No. Account setup, contracts and credentials stay with you. I handle everything technical once you have sandbox access.
How do you handle failures and duplicate callbacks?
Idempotency keys on every write operation, signature verification on inbound webhooks, retry with exponential backoff on outbound calls, and reconciliation so mismatches surface immediately rather than silently.
Will I be able to add more providers myself later?
That's the reason to build it as a layer rather than as one-off integrations. Standard and Premium are structured so the seventh provider is far easier than the first.
Do you sign an NDA?
Yes, happy to before we discuss specifics.
