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Fiverr Pro
English
$
USD
I will fix shopify payment gateway checkout and custom API issues
Mostafijur R.
About this gig
Is your Shopify checkout failing, a payment gateway not working, or a custom API integration causing lost orders?
I will diagnose, fix, or integrate Shopify payment, checkout, webhook, and custom API workflows using supported Shopify features and documented provider methods.
Typical work includes:
Shopify Payments, PayPal, Stripe, or another supported gateway setup
Checkout, cart, payment, redirect, and order-status troubleshooting
Shopify Admin API, GraphQL API, Storefront API, and webhooks
Custom app or third-party platform integration
Authentication, OAuth, webhook, and API error fixes
Order, inventory, customer, subscription, or fulfillment synchronization
Shopify Functions and checkout extensibility when supported
Testing, deployment assistance, and handover notes
I have 6+ years of experience across payment systems, APIs, Laravel, Flutter, SaaS, and e-commerce, plus 155+ completed Fiverr orders.
Shopify plans, payment providers, countries, and checkout capabilities vary. Please message me before ordering so I can review your store and recommend a compliant solution.
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 Mostafijur R.
Mostafijur R.
FinTech and SaaS Developer Flutter Laravel Payments
- FromBangladesh
- Member sinceSep 2018
- Avg. response time1 hour
- Last delivery1 year
Languages
English, Hindi
I help startups and businesses build, rescue, and scale secure FinTech and SaaS products. With 6+ years of experience, I specialize in Laravel/PHP backends, Flutter apps, payment and wallet APIs, SaaS customization, legacy application modernization, and AI integrations.
As Founder of AppDevs, I have led production projects for clients worldwide and completed 155+ Fiverr orders. My focus is clear communication, secure implementation, maintainable code, and dependable support.
Please message me before ordering so I can review your requirements and recommend the right scope.
My Portfolio
FAQ
Which Shopify payment gateways can you work with?
I can work with Shopify-supported providers such as Shopify Payments, PayPal, Stripe, and other documented gateways available for your country and store setup.
Can you fix checkout or payment errors without redesigning my store?
Yes. I can focus only on the defined checkout, payment, API, webhook, or app-conflict issue and preserve the rest of your store.
Can you build or repair a Shopify custom app or API integration?
Yes. I can work with Shopify Admin API, GraphQL, Storefront API, webhooks, OAuth, and approved app or extension workflows.
Do you provide payment or merchant accounts?
No. You must provide your own approved Shopify and payment-provider accounts. I configure or integrate supported services; I do not create or verify financial accounts.
