Ecommerce Integrations & Systems That Scale With You

From Shopify to QuickBooks to fulfillment workflows; we help ecommerce brands streamline the back end so they can grow faster with less chaos.

Free ecommerce consultation

You’ve Got Orders. We’ll Handle the Rest.

Running an eCommerce business means juggling inventory, platforms, payouts, fees, and fulfillment. Certum helps DTC brands and multi-channel sellers manage the financial and operational side of eCommerce with tools that work together and numbers you can trust.

eCommerce System Services

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Shopify + Accounting Integration

We connect Shopify, Amazon, and other sales channels to your accounting platform for accurate sales, returns, taxes, and payouts.

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Inventory & Order Management

Using tools like Katana, Odoo, or Cin7, we centralize stock levels, fulfillment flows, and costing, so you always know what’s in stock and what’s profitable.

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System Optimization & Cleanups

Fix messy setups. Clean up integrations. Automate your workflows. Get ready to scale.

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Merchant & Fee Reconciliation

We track merchant processors (Stripe, PayPal, Square) so your fees are accurateand your books reflect reality.

A black table with a cup of black coffee, tax documents, a smartphone, a yellow calculator, a pen, and a yellow sticky note.

 Sales Tax Compliance & Automation

We help you stay compliant across states and platforms—with tools like Avalara and solid backend structure.

When Systems Don’t Talk to Each Other

Inventory errors, fulfillment delays, and reporting gaps often stem from disconnected systems. Technology Consulting identifies integration gaps and automation opportunities.

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Who It’s for

✔ Shopify, Etsy, and Amazon sellers

✔ Subscription and DTC brands

✔ Retailers expanding into wholesale

✔ Brands with inventory or fulfillment complexity

✔ Multi-channel operators (Omnichannel)

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Built for the Middle Band of Growing Businesses

For businesses between $1M and $20M, eCommerce systems & integration are rarely about “installing software.” It is about aligning systems with real operational complexity. We specialize in ecommerce businesses that have outgrown spreadsheet reconciliation and need integrated inventory, purchasing, landed cost tracking, and accurate COGS reporting.

Our typical clients:

✔️ Generate between $1M and $30M annually

✔️ Need stronger financial reporting and system discipline

✔️ Feel caught between DIY tools and Big 4-style firms

We serve as the bridge between early-stage bookkeeping and full ERP environments; stabilizing systems today while guiding smart transitions tomorrow.

See How We Work

Trusted by Businesses Across Industries

  • “Your team provided a clear path and step-by-step process to obtain the data in the appropriate format for importing and reconciling our data.”

    TEG Lease & BoomCo
    Construction Industry

  • “The team was great to work with. They were knowledgeable, efficient, and timely in all stages of the implementation.”

    Lorentz Meats
    Food Manufacturing Industry

  • “You’ve kept me on track. Your constant communication and proactive approach have made it so much easier to manage everything.”

    Carolina Equine Rescue + Assistance (CERA)
    Non-Profit Industry

  • "I was able to get to know your team, what our relationship would look like, etc. I have to say that so far everything has met or exceeded the expectations."

    Michael Reddington, CEO of Inquasive
    Professional Training and Coaching Industry

  • "You are an all in one shop, which allows a small business like mine to have professional services without using questionable large companies around the world."

    Strapped For Time
    Retail Industry

  • "Walked me through a tutorial in QuickBooks, and specifically helped me figure out how to enter employee costs in order to track job costs.

    Wake Coatings
    Specialty Contractor Industry (Painting)

Learn More

eCommerce & 3rd Party Tools

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CINZ logo with blue geometric design and text
The Avalara logo on an orange background with stylized text.
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Why Choose Certum Solutions?

We understand that eCommerce isn’t just selling products, it’s managing platforms, stock, customer expectations, and razor-thin margins. Our team specializes in the operational side of eCommerce backed by bookkeeping, advisory, and systems support all in one place. This business is BBB Accredited.


✔ Platform-agnostic

✔ Custom system recommendations

✔ Fast cleanups + integrations

✔ Real reports that actually make sense

✔ Advisory + operational support when you need it

FAQ

  • Yes, this is one of our most-requested services. We clean up mapping issues, duplicate entries, and sync errors fast.

  • We specialize in multi-channel ecommerce. We’ll unify your reporting across Amazon, Shopify, Etsy, and more.

  • Yes. If you’re growing fast and not sure which tools can scale, we’ll guide you based on your business model and goals.

  • If you carry physical inventory or do in-house fulfillment, a dedicated inventory tool like Katana or Cin7 will save you time and errors. We’ll help you decide.

  • Certum designs omnichannel inventory architecture that connects ecommerce platforms with accounting and reporting tools.

  • Yes. Proper integration improves real-time visibility and protects gross margins.

Let’s Streamline Your Ecommerce Back End.

From sales to fulfillment to reconciliation, we help eCommerce brands operate with confidence; and scale with strategy.

Free Consultation
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