# How We Built an Internal Payment Flow Using Our Own API at Modem Pay

If you're building payment infrastructure, here's a question for you:

> Would you trust your own API to run your business?

At **Modem Pay**, we do. In fact, we recently built a fully functional **wallet funding flow**, by using the **exact same payment system our merchants use**.

No internal scripts. No admin overrides. Just our **public SDK, payment intents, and webhooks**, used exactly as any third-party merchant would.

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### 🧠 Why We Did This

We needed a reliable way to fund merchant wallets, for funds, and early disbursements. Instead of writing new logic, we asked ourselves:

> “Why reinvent the wheel when we already built a system that works?”

So we ran it *through our own rails*.

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### 🛠️ How It Works: Using Modem Pay to Power Modem Pay

Here’s what we did:

1. Used the Modem Pay SDK to create a **payment intent**
    
2. Generated a **checkout link** like any merchant would
    
3. Processed the **top-up** through our existing flow
    
4. Let our **webhooks** handle the update
    
5. Tracked it with the **same metadata and infrastructure**
    

This wasn’t a dev-only environment. It was the **real deal**, production-grade Modem Pay, funding Modem Pay.

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### 🔁 A Recursive Payment System That Just Works

This internal usage revealed something big: We’ve built a **recursive payment system** that can trigger itself and resolve without error.

We call this behavior the **Modem Loop™**, a clean, resilient loop where:

* Modem Pay acts as both sender and receiver
    
* No hidden routes or privileged logic exist
    
* The same transaction pipeline works for us and our users
    

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### 🔍 Why This Internal Flow Matters

This might sound small, but it’s a massive **signal of platform maturity**. Here’s why it matters:

* **It’s scalable** No extra logic means this can scale with our merchant operations
    
* **It’s testable and traceable** Webhooks, logs, and metadata are consistent
    
* **It’s resilient by design** No branching code or brittle admin logic
    
* **It proves confidence in our own API** We’re literally our own customer, and it just works
    

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### 🔄 How to Use Your Own API Internally (Without Breaking Things)

For developers or fintech teams looking to replicate this idea, here’s what matters:

* **Design your API for public + internal use from day one**
    
* **Avoid special logic or hardcoded exceptions for internal ops**
    
* **Ensure your webhook and metadata systems are consistent**
    
* **Treat yourself like your customer**, same flows, same rules
    

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### 🚀 What's Next for Us

Now that we’ve validated this flow, we’re exploring more **Modem Loop** use cases:

* Running internal settlements
    
* Recursively testing checkout, refunds, and transfers
    

We're building for scale, and if our system can power itself, it can power *anything*.

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### If You Can’t Use It, Don’t Ship It

The phrase “eat your own dog food” gets thrown around a lot. But this isn’t just dogfooding, it’s **recursive trust**.

Our platform doesn’t just serve merchants. It serves **us**, too, using the exact same rails.

And that’s a quiet kind of power.