Merchant Account Glossary

🏦 A — Account Types & Structures

Acquiring Bank (Acquirer) — A financial institution that maintains a merchant account and enables a business to accept credit and debit card payments. The acquirer assumes financial liability for transactions processed through that account and manages settlement of funds to the merchant.

Aggregator (Payment Facilitator) — A platform that sub-merchants under its own master merchant account (e.g., Stripe, PayPal, Square). Aggregators simplify onboarding but offer less flexibility for high-risk merchants, who may be terminated without notice.

Authorized User — A person permitted to use a cardholder's account. Disputes from authorized users can be difficult to fight because the transaction was technically authorized, yet the card network may still side with the issuer.

Authorization (Auth) — A temporary hold placed on a cardholder's funds to verify that the card is valid and has sufficient balance for the transaction amount. Authorizations typically expire after 3–7 days if not captured (settled).

🔄 B — Billing, Batch, & Beyond

Batch — A group of authorized transactions submitted for settlement at the same time. Merchants typically batch once daily at the end of the business day. Delayed batching can result in funds being held beyond standard settlement timelines.

Billing Descriptor — The text that appears on a cardholder's bank statement identifying the merchant. A clear, recognizable descriptor significantly reduces friendly fraud chargebacks caused by customers not remembering the transaction.

Buy Rate — The wholesale interchange rate that acquirers pay to card networks (Visa, Mastercard). Processors add their markup on top of the buy rate to determine the merchant's effective discount rate.

⚠️ C — Chargebacks & Compliance

Chargeback — A forced reversal of funds from a merchant's account initiated by the cardholder's issuing bank. Chargebacks carry fees ($15–$100), count against the merchant's chargeback ratio, and can lead to account termination if thresholds are exceeded.

Chargeback Ratio — The number of chargebacks divided by total transactions, typically calculated monthly. Visa's threshold is 0.9% (by count) or 0.65% (by dollar). Mastercard's threshold is 1.5% by count. Exceeding these triggers monitoring programs.

Chargeback Representment — The process of submitting evidence to challenge a chargeback. Success depends on providing reason-code-specific documentation that proves the transaction was legitimate and properly fulfilled.

Clearing House — The intermediary that processes and settles transactions between issuing and acquiring banks. Examples include the ACH network (NACHA), SEPA (European Payments Council), and card network clearing systems.

CNP (Card Not Present) — Transactions where the physical card is not present, such as e-commerce, phone, or mail orders. CNP transactions carry higher fraud risk and are subject to higher interchange rates.

Credit Card Surcharging — The practice of adding a fee (typically 1.5–4%) when customers pay by credit card. Regulations vary by state and card network — some jurisdictions prohibit surcharging entirely.

📉 D — Discount Rates & Disputes

Discount Rate (Effective Rate) — The total fee a merchant pays for card processing, expressed as a percentage of transaction volume. It includes interchange fees, assessment fees, and the processor's markup. For high-risk merchants, effective rates range from 3.5% to 8% or higher.

Downgrade (Non-Qualified Rate) — When a transaction fails to meet the criteria for the lowest interchange rate (e.g., missing AVS match, incorrect card data), it is downgraded to a higher-cost tier. Minimizing downgrades saves merchants significant money.

Durbin Amendment — A provision of the Dodd-Frank Act that caps debit card interchange fees for large issuing banks. It does not apply to credit cards or to banks with under $10 billion in assets.

🛡️ F — Fraud & Fees

Friendly Fraud — A chargeback initiated by a cardholder for a transaction they genuinely authorized, often because they don't recognize the descriptor, forgot about the purchase, or found it easier than requesting a refund. Friendly fraud accounts for 60–80% of all chargebacks.

Funding (Settlement) — The transfer of captured transaction funds from the acquirer to the merchant's settlement bank account. Settlement timelines range from next-day (T+1) for low-risk merchants to T+3 or longer for high-risk businesses.

🌐 I — Interchange & Issuing

Interchange Fee — The fee paid by the acquiring bank to the issuing bank for each transaction. Interchange rates are set by card networks (Visa, Mastercard, Amex, Discover) and vary by transaction type, card type, industry, and processing method. These are non-negotiable and passed through to merchants.

Issuing Bank (Issuer) — The financial institution that provides credit or debit cards to consumers. The issuer is responsible for authorizing transactions and initiating chargebacks at the cardholder's request.

📋 M — Merchant Account & MATCH

MCC (Merchant Category Code) — A four-digit code assigned by card networks that classifies a business by industry. MCC codes determine interchange rates, eligibility for certain processing programs, and whether enhanced underwriting is required. High-risk MCC codes include 5912 (drug stores/pharmacies including CBD), 5967 (adult content), and 7995 (gambling).

MATCH List (Member Alert to Control High-Risk) — A database maintained by Mastercard of merchants terminated for excessive chargebacks, fraud, or other violations. Placement on the MATCH list makes it extremely difficult to obtain processing for five years. Visa maintains a similar list called the Visa Terminated Merchant File (TMF).

Merchant Account — A contractual agreement between a business and an acquiring bank that enables the business to accept credit and debit card payments. Merchant accounts have specific fee structures, processing limits, and reserve requirements.

MID (Merchant ID) — A unique identifier assigned to each merchant account by the acquiring bank. The MID is used for transaction routing, settlement, and reporting.

🔗 P — Payment Gateway & Processor

Payment Gateway — Software that transmits transaction data from the merchant's website or POS system to the payment processor. Gateways handle encryption, authorization requests, and response routing. Popular examples include Authorize.Net, NMI, and Stripe.

Payment Processor — The intermediary that facilitates communication between the payment gateway, card networks, and acquiring bank. The processor routes authorization requests, handles settlement, and manages the technical infrastructure of payment acceptance.

PCI DSS (Payment Card Industry Data Security Standard) — A set of security requirements established by the PCI Security Standards Council to protect cardholder data. Merchants must validate compliance annually through self-assessment questionnaires (SAQ) or on-site audits depending on processing volume.

💰 R — Reserves & Rolling

Reserve (Rolling Reserve) — Funds held by the acquirer as security against chargebacks and other losses. A rolling reserve holds a percentage of each transaction (typically 5–15%) for a period (90–180 days), releasing funds only after the holding period expires without a chargeback.

Rolling Reserve Account — A separate account where reserved funds accumulate. Funds in the reserve are not available to the merchant until released according to the reserve agreement schedule. Some acquirers require a fixed upfront reserve in addition to a rolling reserve.

Retrieval Request — A request from the issuing bank for transaction documentation, typically preceding a chargeback. Responding to retrieval requests promptly with clear documentation can prevent the dispute from escalating to a full chargeback.

⏱ S — Settlement & Underwriting

Settlement — The process of transferring funds from the cardholder's issuing bank to the merchant's acquiring bank, and ultimately to the merchant's settlement account. Settlement occurs after authorization and capture (batch submission).

Underwriting — The risk assessment process performed by an acquiring bank before approving a merchant account. Underwriting evaluates the business's industry, financial health, processing history, owner background, and chargeback exposure to determine approval terms, pricing, and reserve requirements.