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Payments & Accounting Integrations

PayPal, Stripe and QuickBooks Online, integrated exactly right.

Subscriptions, one-time payments, marketplace payouts and two-way accounting sync. Integrations where "mostly working" is not good enough.

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What's included

  • PayPal v2: subscriptions, upgrades, one-time payments and verified webhooks
  • Marketplace split payments with automatic platform commission
  • Stripe checkout, saved cards, ledgers and organizer payouts
  • QuickBooks Online two-way sync with OAuth 2.0 and token refresh
  • Incremental sync, duplicate detection and failure-safe checkpoints
  • Admin screens, run summaries and alerts

Money and accounting data must be right

Payment and accounting integrations fail in quiet, expensive ways: a webhook that isn't verified, a token that expires overnight, a sync that skips a record after an error. We design for those cases first.

What we build

  • Subscriptions and billing. Monthly/annual plans, mid-cycle upgrades, saved-card billing schedulers and invoices.
  • Marketplaces. Sellers paid directly, with the platform's commission taken automatically.
  • Accounting sync. Two-way QuickBooks Online sync for customers, vendors, items and accounts, plus one-way push for purchase orders, time activities, journal entries and inventory adjustments.

Proof

We replaced a legacy QuickBooks Desktop connector with an unattended two-way QuickBooks Online sync. It was delivered in three client-approved milestones, and 192 of 194 existing customer records were linked automatically, with none left unresolved.

Related work

Where we've done this before

Advertising technology
13Ad products forecast
Ad-tech platform (confidential)

An AI forecasting pipeline that never makes up a number

A hybrid forecasting system producing 30-day impression, CPM, reach and strategy-split forecasts for 13 ad products. Deterministic engines compute every figure; a self-hosted LLM handles classification and narrative.

  • .NET 10
  • C#
  • Python
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Business software & accounting
192/194Records linked automatically
Business software company (confidential)

Replacing a QuickBooks Desktop connector with unattended two-way sync

A two-way sync between a SQL Server business system and QuickBooks Online, replacing a legacy Desktop / Web Connector integration. It runs unattended with automatic OAuth token refresh.

  • C#
  • .NET 10
  • ASP.NET Core
  • SQL Server
Read case study
SaaS · Large file transfer
~800C# files migrated to .NET 10
Attachmore

Attachmore: modernizing a file-sharing SaaS end to end

A .NET Framework 4.6.2 → .NET 10 migration of about 800 files, a 52-page admin portal rebuilt in ASP.NET Core MVC, a new Angular 22 SSR frontend and PayPal subscriptions with a marketplace flow.

  • .NET 10
  • ASP.NET Core
  • EF Core
  • SQL Server
Read case study

Other services

Custom Trucking Software DevelopmentLogistics Workflow AutomationTMS & Accounting Software IntegrationsAI Automation for Logistics CompaniesFreight Broker Software SolutionsLogistics Web Applications & Customer PortalsAI & LLM IntegrationWeb & SaaS Development.NET & Legacy ModernizationMVP Development & LaunchUI/UX DesignDevOps & CloudAI Code Review & RescueBusiness Process Automation

Let’s Solve Your Trucking & Logistics Software Challenges

Tell us about your operation, the systems you use, and the challenges you want to solve. Softlaunchers can help you evaluate a practical approach to software development, workflow automation, and integrations for your logistics business.

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