Zero Floor Limit
A merchant account configuration requiring authorization for every transaction regardless of dollar amount, meaning even the smallest purchases must be approved before processing rather than being automatically accepted below a threshold.
Floor limits historically allowed merchants to process small transactions without authorization to reduce telecommunications costs when dial-up connections charged per call and authorization systems were less reliable. Merchants might have a $25 floor limit, meaning transactions under $25 could be processed without authorization while amounts above required approval. However, modern payment processing has overwhelmingly moved to zero floor limits where all transactions require authorization, driven by enhanced fraud detection capabilities, minimal authorization costs via internet connectivity, card network rule changes encouraging or requiring authorization for all transactions, and the need for real-time decline responses for insufficient funds or stolen cards.
Zero floor limits provide significant fraud protection benefits by preventing transactions on stolen or fraudulent cards regardless of transaction size, enabling real-time detection of insufficient funds or exceeded credit limits, allowing card networks to track and analyze all transaction patterns for fraud monitoring, and ensuring merchants receive authorization codes that provide liability protection for chargebacks. Card networks have progressively tightened floor limit rules over the past two decades, and virtually all new merchant accounts now operate with zero floor limits as standard practice.
The tradeoff of zero floor limits is that merchants pay authorization fees on every transaction, including very small amounts. For merchants processing many low-dollar transactions such as coffee shops, convenience stores, or vending operations, authorization fees of $0.05 to $0.10 can represent a significant percentage of sub-$2 transaction value. However, the fraud prevention benefits and compliance with card network standards generally outweigh authorization fee concerns. Some high-volume, low-ticket merchants negotiate reduced authorization fees or consider alternative payment methods like stored-value cards or mobile wallets for frequent small-dollar transactions, though card acceptance remains essential for customer convenience and sales volume.
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3D Secure
An authentication protocol for online card transactions that adds an additional verification layer between the cardholder and issuing bank, shifting fraud liability from merchants to card issuers when properly implemented.
ACH Payment
Automated Clearing House payment is an electronic bank-to-bank payment method that transfers funds directly between bank accounts through the ACH network, typically used for direct deposits, bill payments, and recurring transactions.
Acquirer
A financial institution that processes credit card payments on behalf of merchants, maintains merchant accounts, and facilitates the settlement of funds from card-issuing banks to merchant bank accounts.
Address Verification Service (AVS)
A fraud prevention tool that compares the numeric portions of a billing address provided during a transaction against the address registered with the card-issuing bank, returning match result codes to help merchants assess transaction risk.
Aggregator
A payment service provider that enables multiple merchants to process card transactions under a single master merchant account rather than each merchant having their own dedicated merchant account, common with services like Square, Stripe, and PayPal.