Crabroom PayInt LLC

We build fintech-heavy systems that help SaaS and marketplaces launch faster, pass audits, raise approval rates, and cut fraud, without burning engineering time.

What you’ll get:
Architecture: Checkout, subscriptions, marketplace payouts, disputes, and fraud, implemented cleanly with reliable webhooks and docs.
Compliance: PCI DSS, HIPAA, GDPR, PSD2/SCA, CCPA, NACHA, PII.
Global Payments: Global gateways (cards, APMs, wallets). We recommend the best fit, not just one provider.
Advanced Stack: Blockchain/Web3 (stablecoins, NFTs), and AI/LLM/GPT automations for KYC, support, fraud, and ops.
Ownership: Audit, development, and integration under one roof + post-delivery support.

Why us:
200+ fintech projects delivered by certified experts.
Top Rated Payments Agency in US

Typical engagements:
Marketplace Payments: Onboarding, fee strategy, transfers/payouts, compliance, reporting.
Recurring Billing: Plans, trials, proration, dunning, analytics wiring.
Fraud & Disputes Sprint: Radar/rules tuning, 3DS strategy, evidence templates, measurable win-rate lift.
Multi-Gateway Rollout: Regional routing, retries.

Core Capabilities:
Audit • Development • Integration • Solution Architecture • API Design • Microservices • Security Hardening • Migration/Replatforming • KYC Flows • Risk Analysis • Chargebacks/Disputes • Subscription/Dunning • Acceptance-Rate Optimization • Routing & Retries • Tokenization • 3DS/SCA Strategy

Gateways & Processors:
Stripe (API/SDK/Terminal/Link/Elements/Connect/Radar/Billing/Checkout/Issuing) • PayPal/Braintree • Authorize.Net • 2Checkout (Verifone) • Worldpay (FIS) • Adyen • Checkout.com • Square • Cybersource • BlueSnap • Payoneer • Sage Pay / Opayo • Razorpay • PayU • Paystack •Klarna • Afterpay • Affirm • Amazon Pay • Apple Pay / Google Pay

Tax:
TaxJar • Avalara • Stripe Tax • QuickBooks • Xero

Web3:
Blockchain • Crypto • NFTs • Stablecoins(USDC) • Smart Contracts • EVM Chains • Wallets • On/Off-Ramps (Coinbase)

Domains:
FinTech • Healthcare IT • SaaS • Marketplaces • eCommerce • InsurTech • Neo-banking • Cross-border Remittance • Subscriptions

Artificial Intelligence:
AI • LLM • GPT • Prompt Engineering • OpenAI • Claude (Anthropic) • Vertex AI • Hugging Face • LangChain • Embeddings • Vector DBs (Pinecone) • KYC/Fraud AI