A Plain-English Glossary of Payment Terms for Merchants
If you have ever read a payment provider's pricing page and felt like it was written in another language, you are not alone. Words like settlement, interchange, chargeback, and stablecoin get thrown around as if everyone already knows them. This payment terms glossary fixes that: it is a plain-English reference written for merchants, not bankers or engineers, so you can finally understand what you are signing up for and what each line on a statement means.
We have organized this payment glossary by theme: money-movement basics, card and contactless terms, bank-transfer and SEPA vocabulary, crypto and stablecoin words, and the fintech terms tied to security and compliance. Skim the section you need, or read it end to end as a crash course.
Key Takeaways
Money-Movement Basics Every Merchant Should Know
Before you can compare providers or read a fee schedule, you need the core vocabulary of how money moves from a customer to you.
Authorization
Authorization is the moment a customer's card or wallet confirms there are sufficient funds and approves the purchase. Think of it as a hold, not a transfer: on a 40-euro item, it checks the 40 euros is available and earmarks it, but the money has not changed hands yet.
Capture
Capture is the step where you tell the payment system to collect the authorized amount. Many in-person purchases authorize and capture at once; others, like a hotel booking or a pre-order, authorize first and capture later when the service is delivered.
Settlement
Settlement is when the funds are finalized and moved toward your account. Merchants care about this term most, because authorization is a promise and settlement is the payoff. Timing varies: card networks often settle in a day or two, while some bank-transfer and crypto flows settle faster.
Payout and Withdrawal
A payout (sometimes called a withdrawal) is the transfer of your available balance from a payment platform to your own bank account. On a mobile payment app you collect payments into a unified dashboard, then choose when to withdraw euros to a SEPA-area bank account. The fee on that movement is the payout fee or withdrawal fee.
Float and Available Balance
Your available balance is the money you can withdraw right now. Funds that are authorized but not yet settled, or settled but still clearing, are sometimes described as being in float. Knowing the difference helps you plan cash flow.
Decoding Fees and Pricing Models
The most expensive part of any payment glossary is the section nobody reads: fees. These fintech terms explain where your money actually goes.
Interchange
Interchange is the fee set by card networks (like Visa and Mastercard) and passed to the customer's card-issuing bank on every card transaction. You do not pay it to the network directly, but it is baked into what your processor charges you, and it is the biggest reason card payments cost more than many other methods.
Processing Fee and Markup
The processing fee is what your provider charges to handle a transaction. Under interchange-plus pricing, you see interchange separately plus a transparent markup. Under flat-rate or blended pricing, everything is bundled into one percentage, simpler to read but able to hide how much is markup.
Payout and Withdrawal Fees
These are charged when you move money out, not when you take a sale, and are often a percentage plus a small flat fee. Some platforms apply a separate charge for fiat withdrawals versus crypto payouts. Whether a fee hits at sale time or payout time changes how you price, so read the schedule for both moments, not just the headline rate.
FX and Spread
FX stands for foreign exchange, the conversion of one currency to another. The spread is the gap between the real mid-market rate and the rate you actually receive, and it is easy to overlook because it is not shown as a line item; it is built into the exchange rate.
MDR (Merchant Discount Rate)
The Merchant Discount Rate, or MDR, is the total percentage a merchant pays to accept card payments, combining interchange, network fees, and your provider's markup. A single all-in card rate is usually a quote of MDR.
Card and Contactless Vocabulary
In-person and online card acceptance have their own dictionary of terms you will meet at the point of sale.
Card-Present vs Card-Not-Present
A card-present transaction happens when the physical card or phone is tapped, inserted, or swiped in front of you. A card-not-present (CNP) transaction is online or over the phone, where you cannot physically verify the card. CNP carries more fraud risk, which often makes it slightly pricier.
NFC and Tap to Pay
NFC (Near Field Communication) is the short-range wireless technology behind contactless payments. Tap to Pay uses NFC so a customer can pay by holding their card or phone near a reader. Some mobile payment platforms, including FiatFlex, let a compatible phone accept Tap to Pay over NFC directly, supporting Visa, Mastercard, Amex, Apple Pay, Google Pay, and Samsung Pay without a separate external terminal.
EMV and Tokenization
EMV is the global chip-card standard (named after Europay, Mastercard, and Visa) that replaced easily cloned magnetic stripes. Tokenization replaces a real card number with a one-time, meaningless substitute called a token, so the actual number is never exposed during the transaction.
Refund vs Chargeback
This pair confuses merchants constantly.
Refunds are under your control; chargebacks are not. Too many chargebacks can raise your costs and put your account standing at risk, which is why clear receipts and good customer service are some of your best financial tools.
Decline, Soft and Hard
A decline means the transaction was refused. A soft decline is a temporary refusal that may succeed if retried, for example when a bank wants extra verification; a hard decline signals a permanent problem like a closed account.
Bank Transfers, SEPA, and Settlement Rails
Once money leaves the card world, it travels over payment rails, the networks that move funds between banks.
Payment Rail
A payment rail is the infrastructure a payment travels on. Card networks are one rail, bank-transfer systems another, and blockchains a newer one, each with different speeds, costs, and reach.
SEPA and IBAN
SEPA (the Single Euro Payments Area) standardizes euro bank transfers across participating European countries, so sending euros between member countries works much like a domestic transfer. An IBAN (International Bank Account Number) is the standardized account number format SEPA uses, and you will almost certainly provide one when you withdraw euros from a payment platform to your bank.
SEPA Credit Transfer and Instant SEPA
A SEPA Credit Transfer is a standard euro bank transfer. Instant SEPA (SEPA Instant Credit Transfer) is a scheme designed to move euros within seconds, where supported by the receiving bank. The key phrase is "where supported": not every bank processes Instant SEPA, so timing can depend on the bank on the other end.
Reconciliation
Reconciliation is the unglamorous but essential task of matching the payments you received against the payouts that landed in your bank, so your books agree with reality. A unified dashboard showing sales and withdrawals in one place makes it far less painful.
Crypto and Stablecoin Terms in Plain English
Crypto adds a fresh batch of vocabulary to any payment terms glossary. You do not need to be a blockchain expert to accept these payments, but a few definitions help.
Blockchain and Solana
A blockchain is a shared digital ledger that records transactions across many computers, so no single party controls it. Solana is one such blockchain known for fast confirmations and low transaction costs, which suits it well to payments. Some platforms let merchants accept crypto on the Solana blockchain via payment links and QR codes.
Stablecoin, USDC, and EURC
A stablecoin is a crypto token designed to hold a steady value by tracking a traditional currency.
Because their value is meant to stay stable, stablecoins are far more practical for everyday pricing than volatile coins. Merchants can accept USDC, EURC, and SOL (Solana's native token), then decide what to do next.
Wallet, Address, and On-Chain
A wallet is the app or device that holds a customer's crypto and signs transactions. An address is the destination string a payment is sent to, similar to an account number. On-chain means a transaction has been recorded on the blockchain itself.
Conversion and Manual Settlement
Conversion is exchanging crypto for a traditional currency such as euros. Some platforms offer manual control: rather than auto-converting every payment, the merchant decides when to convert to euros and when to withdraw. FiatFlex works this way, so you choose your own timing instead of converting at the moment of sale.
Gas Fee
A gas fee is the small network charge paid to process a transaction on a blockchain. On low-cost networks these fees are typically tiny, part of why such networks appeal to merchants handling many small payments.
Security, Identity, and Compliance Terms
The final cluster of fintech terms covers trust: who you are and the rules everyone operates under. Understanding these makes onboarding feel routine instead of intimidating.
KYC, KYB, and AML
KYC stands for Know Your Customer, the identity verification of an individual, and KYB (Know Your Business) is the equivalent check for a company. Both may be required when you sign up for a payment platform and are a standard part of modern onboarding, not a sign that anything is wrong. They are tools that support AML (Anti-Money-Laundering), the broad set of practices and laws aimed at preventing illicit funds from moving through financial systems.
PSD2 and MiCA
These are European regulatory frameworks you may see referenced. PSD2 is a directive governing payment services and stronger customer authentication, while MiCA is a framework focused on markets in crypto-assets. You do not need to memorize the statutes, but recognizing the names helps you follow industry news with confidence.
Two-Factor Authentication (2FA)
Two-factor authentication adds a second proof of identity, such as a one-time code, on top of your password. Enabling 2FA on any account that touches your money is one of the simplest, highest-impact security habits available.
How to Use This Glossary in Real Decisions
A glossary is only useful if it changes what you do. Pull up your latest statement and label each line: is it a processing fee, a payout fee, an FX spread, or a chargeback cost? Once every charge has a name, you can compare providers honestly and ask sharper questions, such as when settlement happens, whether the quote is interchange-plus or blended, and whether Instant SEPA is supported for your bank. The same fluency helps you match each sale to the right rail instead of forcing one method on every customer.
Frequently Asked Questions
What is the difference between settlement and payout?
Settlement is when a transaction's funds are finalized within the payment system and become part of your balance. A payout (or withdrawal) is the separate step of moving that settled balance into your own bank account. Money can be settled but not yet withdrawn, so check both timings when planning cash flow.
Why are chargebacks worse for merchants than refunds?
A refund is something you choose to issue, so it stays under your control and rarely carries a penalty beyond the returned amount. A chargeback is a bank-driven reversal initiated by the customer, often with an added dispute fee, and a high chargeback rate can raise your costs and threaten your account standing. Clear receipts, accurate product descriptions, and responsive support keep chargebacks low.
Are stablecoins like USDC and EURC practical to accept as a merchant?
Stablecoins are designed to track a traditional currency, with USDC tracking the US dollar and EURC the euro, which keeps their day-to-day value far steadier than volatile coins. That stability is what makes them workable for pricing. As with any method, you decide how quickly to convert to euros, and platforms with manual conversion let you control that timing rather than converting at every sale.
Do I really need to complete KYC or KYB checks?
Yes, and it is normal. KYC verifies an individual's identity and KYB verifies a business's details. These checks are a standard part of onboarding with modern payment platforms and support broader Anti-Money-Laundering goals. Having your identity documents and business information ready makes the process quick and removes a common cause of onboarding delays.
FiatFlex is a mobile payment app that lets merchants accept crypto and contactless Tap to Pay payments and withdraw euros via SEPA from a unified dashboard. Learn more at https://www.fiatflex.com or contact@fiatflex.com.