SQ*, TST*, PAYPAL*: the processor prefix explained

What a payment facilitator is

A payment facilitator (PayFac) is a company that lets many smaller merchants accept cards under one umbrella merchant account. Square, Toast, PayPal, Stripe, and Paddle are the biggest examples. The coffee shop does not have its own merchant account with a bank — it accepts cards through Square’s.

Card network rules require the facilitator to identify itself on the customer’s statement, which is why the prefix appears: SQ* for Square, TST* for Toast, PAYPAL* for PayPal. The marker is mandated, not cosmetic.

The anatomy of a prefixed descriptor

A prefixed descriptor is prefix + asterisk + merchant name: SQ *DAILY GRIND CAFE. Square’s documentation states the prefix is static and the business name after it is limited — in Square’s case, 20 characters, truncated if longer.

The prefix always survives truncation; the merchant’s name is the part that gets cut. That is why TST* is followed by a stump like RIVERSIDE DIN and PAYPAL* by a partial seller name — the network is protecting the facilitator identifier, not the store.

What the prefix tells you about the charge

The prefix identifies the rail, not the seller: SQ* means a small business on Square (coffee shops, salons, food trucks), TST* means a restaurant or cafe on Toast, PAYPAL* means a seller paid through PayPal (including online marketplaces), PADDLE* means a software or digital service.

When a charge is unrecognizable, the prefix narrows the search dramatically: a SQ* charge is in-person at a local business; a PAYPAL* charge is likely an online purchase; a PADDLE* charge is a subscription you probably forgot.

1. Read the prefix as the processor SQ* Square, TST* Toast, PAYPAL* PayPal, PADDLE* Paddle, GOOGLE* Google services. This is who moved the money.
2. Read the suffix as the merchant The part after the * is the store or seller — truncated, so complete it mentally with the city or store you visited.
3. Match date and amount A SQ* charge on a Saturday morning is probably that coffee shop; a PADDLE* charge mid-month is likely a subscription.
4. Decode the full line The decoder knows the major facilitator prefixes and can map the suffix to known merchants.

Prefixes beyond the big four

The same pattern applies across the ecosystem: GOOGLE* and GOOGLE*YOUTUBE for Google products, APPLE.COM/BILL for Apple services, MSBILL.INFO for Microsoft, AMZN MKTP US for Amazon Marketplace, and older aggregators like DRI* (Digital River) and CCBILL* for adult and software merchants.

The prefix pattern is so consistent that the hub pages on this site organize entire descriptor families by it — every SQ* family, every TST* family, every PADDLE* family is catalogued there.

When the prefix hides the merchant

The system has a known weakness: because the prefix eats the character budget, small merchants with long names can end up with a suffix too short to identify. If SQ * or PAYPAL * is followed by four unreadable letters, the amount and date are your best clues — and the merchant, once identified, can confirm the charge.

If nothing matches, the charge deserves the standard treatment: contact the merchant if identifiable, otherwise report it to your bank within the applicable window. But check the prefix first — most "mystery" processor charges turn out to be a store you actually visited.