Interlink is a U.S. debit card network owned and operated by Visa. It processes PIN-based debit transactions, meaning purchases where you enter your personal identification number at checkout rather than signing a receipt. If you’ve ever looked at the back of your Visa debit card and noticed a small “Interlink” logo, that’s the network your bank has enabled for PIN debit purchases and, in many cases, ATM withdrawals.
How Interlink Fits Into Your Debit Card
Most Visa debit cards carry more than one network. The Visa logo on the front handles signature-based transactions, where you swipe, tap, or insert your card and sign (or skip signing for small amounts). Interlink handles the PIN side of things. When a retailer’s terminal asks you to choose “debit” and enter your PIN, the transaction typically routes through a PIN debit network like Interlink instead of going through Visa’s main credit and signature network.
Your card may also carry other network logos. The Plus network, for example, is another Visa-affiliated network, but it only handles ATM transactions. Interlink covers both PIN debit purchases at merchants and ATM access, making it the broader of the two.
What Happens During an Interlink Transaction
When you select “debit” at a point-of-sale terminal and type in your PIN, the terminal sends the transaction through a PIN debit network. If Interlink is the network on your card (and the merchant’s processor supports it), the transaction travels from the merchant’s terminal to the merchant’s bank, through the Interlink network, and on to your bank. Your bank verifies your PIN, checks your account balance, and approves or declines the purchase. The funds are pulled directly from your checking account.
This differs from a signature-based Visa transaction in a few practical ways. PIN debit transactions are authorized in real time against your actual bank balance, so there’s less chance of an overdraft slipping through unnoticed. They also settle quickly, with money typically leaving your account the same day. For merchants, PIN debit transactions often carry different processing costs than signature transactions, which is one reason many retailers prefer to route purchases through PIN networks when possible.
Where Interlink Works
Interlink is a U.S.-focused network. Merchants that accept Interlink transactions must be located in the United States or U.S. territories, and any company processing Interlink transactions must have its principal place of business in the U.S. or a U.S. territory. Interlink transactions are explicitly not permitted in Canada. So if you travel internationally, your card’s PIN debit purchases would route through a different network, or your card would fall back to Visa’s global signature network.
Within the U.S., Interlink is widely accepted. Most major retailers, grocery stores, gas stations, and restaurants that accept Visa debit cards can process Interlink PIN transactions. The network also supports card-not-present transactions (online or phone purchases) as long as the merchant is based in the U.S.
Why Merchants and Banks Care About Interlink
The distinction between PIN debit and signature debit matters most on the cost side. Merchants don’t pay interchange fees directly to Visa. Instead, they negotiate a “merchant discount rate” with their payment processor, which bundles interchange and other costs into a single per-transaction fee. However, the underlying interchange rates differ depending on whether a transaction routes through a PIN network like Interlink or through Visa’s signature network.
Federal regulations require that debit cards offer merchants a choice of at least two unaffiliated networks for routing transactions. This is why your Visa debit card carries an additional PIN debit network alongside the Visa signature network. Interlink is one of the networks that fulfills this requirement, competing with other PIN debit networks for merchant routing. Merchants can choose to route PIN debit transactions through whichever network offers them the best pricing, which creates competition that helps keep costs in check.
How Interlink Affects You as a Cardholder
For everyday use, you rarely need to think about Interlink. Your bank chose which PIN debit network to put on your card, and the routing happens automatically when you select “debit” at checkout. You won’t see a separate charge or fee from Interlink on your bank statement. The transaction just appears as a normal debit purchase.
The main practical difference you might notice is speed. PIN debit transactions through networks like Interlink tend to post to your account faster than signature-based purchases, which can take a day or two to fully settle. If you’re closely managing your checking account balance, choosing “debit” and entering your PIN gives you a more immediate and accurate picture of your available funds.
Some banks also treat PIN and signature debit transactions differently for rewards or daily spending limits. Check your bank’s debit card terms if you want to know whether choosing PIN versus signature at checkout changes your rewards earning or purchase limits.