Payment Integration
Specialist
I help SaaS companies, marketplaces, and startups build reliable payment infrastructure using Stripe Connect, Stripe Billing, PayPal, Checkout, Webhooks, subscriptions, invoicing, and custom payment workflows.
Interactive demos in Stripe test mode and PayPal sandbox — walk through partner onboarding, payments, and payouts yourself. No account required.
See How I Build Payment Systems
Watch these three short walkthroughs to understand how I design production-ready payment infrastructure for SaaS platforms and marketplaces — Stripe Connect, PayPal, and beyond.
Step 1
DemoStripe Connect Working Demo
Payment models, customer portal, Stripe KYC onboarding, Express vs Standard accounts, and the partner dashboard — end to end.
Step 2
2 minHow Payment Integrations Work
See how Stripe Billing, PayPal, Checkout, subscriptions, and webhooks fit together in a real payment system.
Step 3
3 minHow to Build an Escrow System with Stripe Connect
See how Stripe Connect accounts, payment holds, transfers, and payouts work together in a real marketplace escrow flow.
✅ Great! You've now seen how I approach payment architecture.
Testimonials
What our client are saying about us
We've been working with Kavya for the last 4 years, primarily on payment automation for our freight platform, building out multi-provider routing across Stripe, PayPal, and a couple of regional providers to handle failovers when one gateway has issues.
What actually got our attention, even before we hired him, was how much he helped without asking for anything in return. Early on, when Stripe pushed API changes, he flagged the impact on our integration before we'd even asked him to look at it, and walked us through the fix. He never pushed us to hire him. He just focused on helping.
That hasn't changed since. At one point our PayPal webhook handling would have broken under high transaction volume, and he caught it and had it patched before it caused any downstream issues for us. He takes ownership without being told to, communicates clearly, and thinks a step beyond whatever task is in front of him.
We're still working with him today. If you're looking for a partner rather than a contractor, someone who handles payments carefully and engineers things properly, Kavya is who I'd point you to.
Sunil G
Director, SG Freight Private Limited
Thanks and I appreciate how reliable you are. I've worked with so many & you have been the best experience time and time again.
Jordan Gill
Founder, Systems Saved Me
Kavya is not only technically skilled but also a great communicator and highly professional. I look forward to new collaborations with him and highly recommend his services to others!
Wayaz Mirza
Founder, Homework LLC
Kavya gave great advice and suggestions for how to build a successful Saas product. He's very kind and helpful; you can tell he loves what he does. I'll definitely be seeking his expertise again!
Nicole Larson
Founder, Asset Assign
Very fast and professional work. I had that problem for couple of days, but Kavya Gaur fixed it in matters of hours.
Hristo Hristov
Client
Kavya is great to work with and delivers with high quality
Konica Miolta
Client
Responsive and competent
Mark Katchen
Founder, The Phylmar Group
Trusted by teams
Some of the companies I have worked with
From freight marketplaces to SaaS billing stacks — a selection of partners who rely on me for Stripe Connect, PayPal, payouts, and production payment infrastructure. 70+ companies in total.
SG FREIGHT PVT LTD
Connect · PayPal · Vendor payouts
Homework LLC
Billing · Subscriptions
1 to 100
Marketplace payments
Flipper Log
Checkout · Webhooks
Asset Assign
Invoicing · Splits
Wishara
Connect · Onboarding
Supertek Dies and Tools
B2B payments
Systems Saved Me
Payment infrastructure
Fancoore
Marketplace · Connect
Insemoo
Billing · Subscriptions
At Your Service Psychiatry
Healthcare payments
Programming Journeys
Checkout · Billing
Little Spark
Subscriptions
Drawerrr
Marketplace payments
Get Lean
Billing · Webhooks
Real results. Real data.
Every integration I build — Stripe, PayPal, or both — is measured by revenue recovered, failures prevented, and engineering time saved.
SG Freight Pvt Ltd
Built SG Freight Pvt Ltd's internal payments infrastructure from the ground up. The system automates the full money-flow lifecycle: onboarding vendors onto Stripe Connect and PayPal, splitting incoming freight revenue between the platform and vendors in real time, and triggering scheduled payouts — replacing what had previously been a manual, error-prone process. The platform has processed $3.7M+ in total revenue across Stripe and PayPal rails, with peak monthly volume hitting $400K — and no manual intervention required. I've continued as their ongoing payments consultant for 4 years, extending the system as their business needs evolve.
- •Onboarded 120+ freight vendors onto Stripe Connect Express and PayPal across the US, Mexico, Canada, and LATAM corridors
- •Automated destination charges and platform fees on import/export shipment payments — with PayPal for cross-border vendor settlements where needed
- •Scheduled vendor payouts replaced spreadsheet-based weekly reconciliations
- •Webhook-driven ledger keeps Stripe and PayPal transfers, holds, and payouts in sync across 8 countries
B2B SaaS Platform
Inherited a broken Stripe integration causing ~8% monthly revenue leakage. Rebuilt webhook handlers, subscription state management, and proration logic from scratch.
- •Eliminated subscription state drift with idempotent webhooks
- •Won 9+ Stripe disputes with proper evidence automation
- •Reduced billing support tickets by 75%
- •Implemented automated dunning and smart retry sequences
// the_pattern
Payments work on day one. Then billing gets real.
Payments go through — but subscription state, webhooks, retries, upgrades, and cancellations quietly break across Stripe, PayPal, and your app. Revenue leaks compound. Here's what the data shows:
Access bugs — users lose features they paid for
Impact: Support tickets +40%Failed renewals — subscriptions silently expire
Impact: Revenue leak ~8%Webhook gaps — state drifts between Stripe, PayPal, and your app
Impact: Data inconsistencyBilling mismatches — invoices don't match actual usage
Impact: Customer churn riskUpgrade chaos — proration logic breaks mid-cycle
Impact: Revenue miscalculationManual fixes — your team is patching billing in production
Impact: Engineering time waste// process
How I Build Production-Ready Payment Systems
A methodical, data-driven approach to billing architecture — designed for SaaS and marketplaces that scale on Stripe, PayPal, or both.
Payment Architecture First
Model subscription tiers, proration rules, invoicing, and lifecycle — before writing code. Map whether Stripe, PayPal, or both become the source of truth for billing state.
Webhooks & State Sync
Secure, idempotent webhook handlers that reliably sync subscription and payout state between Stripe, PayPal, and your database. No missed events.
Production Alignment
Test and live environments stay consistent. Edge cases — failed payments, PayPal disputes, expired cards, disputed charges — handled before they happen.
Payment integration components
Building blocks I use to deliver reliable billing: Stripe, PayPal, subscriptions, webhooks, and payment flows.
Bespoke Billing Engine
Subscription logic tailored to your product and pricing — Stripe or PayPal.
Read moreWebhook Pipeline
Idempotent, retried, and observable event handling across Stripe and PayPal.
Read moreReporting & Analytics
Revenue metrics and reconciliation ready for finance — unified across rails.
Read moreQuestions I'll ask about your payment setup
So we can quickly identify where to focus — whether you're on Stripe, PayPal, or both.
Do you use a custom billing page?
Custom vs Stripe- or PayPal-hosted checkout affects architecture, PCI scope, and how we handle upgrades.
How do you handle failed payments?
Dunning, retries, and communication flows are often the biggest revenue leak — on Stripe and PayPal alike.
Do you prorate on plan changes?
Proration and credit logic need to be consistent and auditable across payment providers.
What's your webhook and idempotency strategy?
Duplicate or missed Stripe or PayPal events can cause double charges or missed renewals.
Do you need Stripe, PayPal, or both?
Marketplaces and cross-border businesses often need dual-rail setup — Connect for splits, PayPal for international vendors.
How are payouts handled?
Vendor and partner payouts via Stripe Connect, PayPal Payouts, or a mix — with a single ledger keeping everything in sync.
About me
Hi, I am Kavya & I got into Stripe by accident.
Most of my clients were building SaaS products and marketplaces, and sooner or later we'd hit the same challenge—payments. What looked like a simple "Stripe integration" almost always turned into subscriptions, Stripe Connect, PayPal, webhooks, payouts, and edge cases.
I genuinely enjoyed solving those problems, so I kept going deeper. Today, I focus on helping businesses build payment systems that are reliable from day one, whether it's Stripe Connect, PayPal, subscriptions, or custom payment workflows.
Let's fix your payment integration.
Book a 30-minute consultation with Kavya. Share your current Stripe or PayPal setup, billing challenges, or integration plans — and get a clear technical assessment.
Book a Payment Integration Consultation