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I will fix integrate shopify payment gateway bnpl stripe paypal api adyen authorize net
david
About this gig
Is your Shopify checkout broken, payment failing, or Stripe webhook not firing? I fix, set up and integrate payment gateways fast, using Claude AI and Claude Code for clean, tested, secure code
I INTEGRATE & FIX:
- Shopify Payments, Shop Pay, Shopify Balance, gateway verification help
- Stripe API, Checkout, Elements, Payment Intents, Connect, subscriptions, billing, webhooks, SCA/3D Secure
- PayPal API, Smart Buttons, PayPal Commerce, Venmo
- Adyen Drop-in, Authorize.net Accept.js, Braintree, Square, Klarna, Afterpay, Affirm, BNPL
- Apple Pay, Google Pay, Amazon Pay, Wise, Payoneer, 2Checkout, Mollie, iDEAL, Bancontact, Razorpay, Paystack, Flutterwave, M-Pesa, crypto
- PLATFORMS: Shopify, WooCommerce, WordPress, Wix, Squarespace, GoHighLevel, ClickFunnels, Laravel, PHP, Node.js, Next.js, React, Django, Flutter, Supabase, Lovable, Bolt, Replit.
PROBLEMS SOLVED: "There was an issue processing your payment", payment method not showing, Apple Pay button missing, duplicate orders, declined cards, currency mismatch, API key errors, test-to-live switch, PCI-compliant secure checkout
Message me your platform + gateway for a quick quote today. Fast delivery, free test checkout!
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know david
david
AI App Developer, Build, Fix, Integrate Deploy
- FromNigeria
- Member sinceAug 2026
- Avg. response time1 hour
Languages
English, Spanish, French, Italian
Hi, I’m David, a Full-Stack AI Developer helping businesses, startups, and creators build, fix, integrate, and launch modern digital products.
I specialize in Base44, AI app development, SaaS, web apps, API integrations, databases, authentication, automation, and deployment. I can fix broken AI-built apps, troubleshoot bugs, improve existing features, connect third-party services, migrate applications, and turn ideas into functional, launch-ready products.
My approach is simple: understand your goal, solve the real problem, and deliver a reliable solution that works.
FAQ
Which payment gateways can you integrate?
Stripe, PayPal, Shopify Payments, Adyen, Authorize.net, Braintree, Square, Klarna, Afterpay, Affirm, Apple Pay, Google Pay, Amazon Pay, Wise, Payoneer, Mollie, Razorpay, Paystack, Flutterwave and M-Pesa
Can you fix a Shopify checkout that won't process payments?
Yes. I check gateway credentials, test mode, theme and app conflicts, currency settings and abandoned-checkout payment events, then fix the cause and run a live test order.
Do you set up Buy Now Pay Later (Klarna, Afterpay, Affirm)?
Yes. I enable and configure BNPL, fix "payment method not showing" issues, add product-page installment messaging, and test checkout across supported markets and currencies.
Can you fix Stripe webhook errors?
Yes. I debug failed signatures, timeouts, retries and missing events (checkout.session.completed, payment_intent), then make order fulfillment reliable with idempotent webhook handling.
Do you work with Adyen and Authorize.net?
Yes. I build Adyen Drop-in/Components and Authorize.net Accept.js or API integrations, with secure tokenization, 3D Secure, error handling and sandbox-to-live testing.
Which platforms do you support?
Shopify, WooCommerce, WordPress, Wix, Squarespace, GoHighLevel, ClickFunnels, plus custom Laravel, PHP, Node.js, Next.js, React, Django, Flutter and Supabase apps.
