Introduction to Online Payments
Welcome to online payments. This guide explains how money moves from your customer's card to your bank account, and what you need to know to get paid reliably.
Most of this happens automatically when you sign up with a payment provider. But understanding the basics helps you ask better questions, troubleshoot problems, and avoid overpaying.
What You'll Learn
- The key players in a payment transaction
- How money moves from your customer to your bank account
- The difference between a payment gateway and payment processor
What Happens When Someone Pays You
| Step | What Happens | How Long |
|---|---|---|
| 1. Customer taps "Pay" | Your processor sends card details to the card network | Milliseconds |
| 2. Authorization | Issuing bank approves or declines | 1-2 seconds |
| 3. Capture | You confirm the sale (automatic or manual) | Same day |
| 4. Settlement | Money transfers from issuer to your processor | 1-2 business days |
| 5. Funding | Your processor deposits into your bank account | 1-3 business days |
That's the whole flow. The rest of this guide explains each step and what to do when things go wrong.
The Payments Ecosystem
Every online transaction involves four key players:
| Player | Who They Are | What They Do |
|---|---|---|
| Customer | The person buying | Enters their card details |
| Merchant | You | Sells the product, receives the money |
| Acquirer (your processor's bank) | Your payment provider's bank | Deposits money into your account |
| Issuer (customer's bank) | Customer's bank (Chase, Citi, etc.) | Approves or declines the transaction |
When you sign up with Stripe, Square, or similar providers, they handle the acquirer relationship for you. You don't need to set up a separate merchant account. (A merchant account is a special bank account that holds your card payment funds before they're deposited to your regular business account. All-in-one providers like Stripe and Square include this automatically.)
The Flow of a Transaction
Here's a simplified view of what happens when a customer clicks "buy":
You don't need to memorize this. But when a payment fails or money doesn't arrive, this is how you figure out where it got stuck.
- The customer enters their payment details on your checkout page.
- This information is securely sent to your payment gateway.
- The payment gateway sends the transaction details to the payment processor.
- The processor routes the transaction to the card networks (Visa, Mastercard, etc.).
- The card network communicates with the customer's bank (the issuer) to check for funds and approve the transaction.
- The approval (or decline) message travels back through the chain to your website, and the customer is notified.
- If approved, the funds are eventually transferred from the issuer to your merchant account (this is called settlement, when the money actually moves from the customer's bank to yours, usually 1-2 business days).
This entire process usually takes just a few seconds!
A payment gateway is the software that securely collects card details. A payment processor moves the money between banks. Modern providers like Stripe, Square, and Shopify Payments bundle both into one service, so you don't need to set them up separately. You'd only deal with a separate gateway if you're using a traditional merchant account (typically at $500K+/month).
What This Means for Your Business
A few practical takeaways:
- You get paid in 1-3 days, not instantly. The authorization is immediate, but money takes time to settle into your bank account.
- Declines happen. About 10-15% of transactions get declined. Some you can recover, some you can't.
- Every step costs money. The card networks, issuing banks, and your processor all take a cut. That's why fees exist.
- Problems usually trace back to one player. When something goes wrong, knowing this flow helps you figure out who to call.
Your One Action
Pick a processor and create a free account. You can process a test payment in under 15 minutes.
- Selling online? Start with Stripe or Square
- On Shopify? Use Shopify Payments (avoids the extra transaction fee)
- Retail/in-person? Start with Square (free card reader included)
- Not sure? The next lesson has a full comparison with 5 providers
What You'll Need to Get Started
Most providers approve you in minutes. Here's what to have ready:
- A bank account for deposits
- Tax ID / EIN (or SSN for sole proprietors)
- Business address and website (or social media page)
- A product or service to sell
- About 15 minutes for signup