What a B2B payment gateway does

A B2B payment gateway is software that connects a business's website or accounting system to the payment networks that move money between companies. When one business sends a payment to another—whether by card, bank transfer, or invoice—the gateway captures that payment, verifies the transaction, and routes it to the right bank or processor. It sits between the buyer and the seller's bank.

The key difference from consumer gateways is that B2B transactions are usually larger, happen less frequently, and involve different payment methods. A B2B gateway handles purchase orders, invoices, and recurring billing in ways a retail gateway does not. It also connects to accounting software like QuickBooks or NetSuite so the payment lands in your records automatically.

Without a gateway, you would have to process each payment manually—asking for a check, wire details, or card information, then entering it into your system by hand. A gateway automates that work and reduces the chance of error or fraud.

Key Takeaways

  • A B2B payment gateway connects your business to payment networks and banks, letting you accept payments from other companies without manual entry.
  • B2B gateways handle larger transactions, invoicing, and recurring billing—features that consumer gateways often do not include.
  • The gateway verifies each transaction, checks for fraud, and sends the money to your bank while updating your accounting software in real time.
  • Most B2B gateways charge a percentage of each transaction plus a monthly fee, and some require a minimum monthly volume to keep rates low.
  • Integration with your accounting system means invoices, payments, and reconciliation happen automatically instead of requiring manual work.

How payment flows through a B2B gateway

When a customer enters payment details on your invoice or checkout page, the gateway encrypts that information and sends it to the payment processor. The processor checks the card or bank account with the issuing bank to confirm funds are available and the account is not flagged for fraud. This verification usually takes a few seconds.

If the bank approves the transaction, the processor tells the gateway, which confirms the payment to your customer and logs it in your system. The money then moves through the banking network—this can take one to three business days depending on the payment method. ACH transfers (bank-to-bank) are slower but cheaper; card payments are faster but cost more in fees.

Throughout this process, the gateway is also checking for red flags: mismatched addresses, unusual amounts, velocity (too many transactions in a short time), and whether the card or account has been reported stolen. If something looks wrong, the gateway can decline the transaction or flag it for manual review before the money leaves your account.

Payment methods B2B gateways accept

Most B2B gateways accept credit and debit cards, but the real power is in bank-to-bank methods. ACH (Automated Clearing House) transfers let one business send money directly from its bank account to yours. Wire transfers are faster but more expensive. Some gateways also accept virtual cards—single-use card numbers that a buyer's accounting system generates for each invoice, which reduces fraud risk because the card expires after one use.

Invoice-based payment is another B2B feature. Instead of asking a customer to enter card details, you send an invoice link. The customer clicks it, chooses their payment method, and pays without leaving their email. This is common for SaaS companies and service providers because it matches how businesses already work—they receive an invoice, they pay it.

Some gateways also handle international payments, which means accepting payments in foreign currencies and converting them to your home currency. The exchange rate and conversion fee vary by gateway and by currency pair, so this is worth comparing if you work with overseas customers.

Integration with accounting and ERP systems

The real time-saver is when your gateway connects directly to your accounting software. When a payment comes in through the gateway, it automatically creates a record in QuickBooks, Xero, NetSuite, or whatever system you use. The invoice is marked paid, the money is logged as received, and your accounts receivable balance updates without anyone typing anything.

This integration also means reconciliation—matching what your bank says you received against what your accounting system says you should have—happens automatically. Without it, you spend hours each month comparing bank statements to invoices and hunting for missing or duplicate entries. With it, discrepancies show up as alerts you can investigate instead of surprises you find months later.

Some gateways offer deeper integration: they can pull customer and invoice data from your accounting system, pre-fill payment forms, and even trigger follow-up actions like sending a receipt or updating a customer's credit status. The depth of integration depends on which gateway and which accounting system you use, so check compatibility before signing up.

Fees and pricing models for B2B gateways

B2B gateways charge in several ways. Most take a percentage of each transaction—typically 1.5% to 3% depending on the payment method and your volume. ACH transfers usually cost less (0.5% to 1%) because they are cheaper for the processor to handle. Card payments cost more because the card network and issuing bank take a cut. Wire transfers often have a flat fee per transaction instead of a percentage.

Many gateways also charge a monthly fee, ranging from $25 to $500 or more depending on features and transaction volume. Some waive the monthly fee if you hit a minimum monthly volume—for example, $50,000 in transactions per month. Others charge a setup fee when you open the account, though this is becoming less common.

A few gateways use a tiered model: the more you process, the lower your percentage rate. This rewards high-volume businesses but can make it hard to predict costs when you are starting out. Ask for a cost breakdown based on your expected monthly volume before you commit, and ask whether rates change if your volume drops.

Fraud detection and security in B2B gateways

B2B gateways use multiple layers of fraud detection because the stakes are higher—a fraudulent transaction might be for thousands of dollars instead of hundreds. The gateway checks the transaction against known fraud patterns, looks for velocity abuse (many transactions from the same account in a short time), and compares the billing address to the shipping address if applicable.

Most gateways also support 3D Secure, a protocol that adds an extra verification step—the cardholder enters a password or receives a code on their phone before the payment goes through. This is especially useful for high-value transactions or international payments. Some gateways let you set rules: for example, decline any transaction over $10,000 unless it comes from a known customer, or require 3D Secure for all card payments over a certain amount.

The gateway encrypts all payment data using SSL (Secure Sockets Layer) or TLS (Transport Layer Security), the same encryption banks use. This means payment details are scrambled while they travel from your customer's browser to the gateway and from the gateway to the processor. The gateway itself should be PCI DSS compliant, which means it meets the Payment Card Industry's security standards and is audited regularly.

Choosing between B2B gateways

The right gateway depends on your payment methods, your accounting software, and your transaction volume. If you mostly receive ACH transfers from established customers, you need a gateway that handles ACH well and integrates with your accounting system. If you work with international customers, you need one that handles currency conversion. If you are a SaaS company sending invoices, you need one with strong invoice payment links.

Check whether the gateway integrates with your accounting software before you sign up—this is often a dealbreaker. Ask about setup time: some gateways go live in hours, others take days or weeks. Ask about support: do they have phone support, or only email and chat? What is their response time for fraud alerts or payment failures?

Start by listing your must-haves (which payment methods, which accounting software, which countries) and your nice-to-haves (reporting dashboards, API access, white-label options). Then get pricing from three to five gateways that meet your must-haves and compare the total cost over a year based on your expected volume. The cheapest is not always the best if it lacks features you need or has poor integration with your system.

Frequently Asked Questions

How long does it take for money to arrive in my bank account after a customer pays?

It depends on the payment method. Card payments usually settle in one to two business days. ACH transfers take three to five business days because they move through the banking network. Wire transfers can arrive the same day or next day but cost more. Your gateway should show you the expected settlement date when the payment comes in.

What happens if a customer disputes a payment after it settles?

The customer's bank can issue a chargeback, which reverses the transaction and pulls the money back out of your account. You then have a window (usually 10 days) to dispute the chargeback by providing proof the customer authorized the payment and received the goods or service. The gateway usually handles the paperwork, but you need to keep records—invoices, emails, delivery confirmations—to win the dispute.

Can I use a B2B gateway if I also sell to consumers?

Yes. Most B2B gateways accept both business and consumer payments. The difference is in the features and pricing—B2B gateways often have higher transaction limits and better accounting integration, while consumer gateways focus on speed and simplicity. You can use one gateway for both if it supports the payment methods you need.

Do I need a separate merchant account for a B2B gateway?

Usually yes. A merchant account is a bank account that holds the money from card and ACH transactions before it settles into your main business bank account. The gateway provider often sets this up for you as part of onboarding, but you should confirm whether they handle it or whether you need to open one yourself.

What if my gateway goes down during a payment?

Most gateways have uptime guarantees (often 99.5% or higher) and redundant systems so they rarely go down. If they do, transactions usually queue and process once the system is back up. Ask your gateway about their backup procedures and what happens to payments during an outage before you sign up.