Pay-by-link and online payment portals aren't competing solutions. They solve two different payment problems, and the businesses that get the most out of online payment acceptance usually offer both, rather than picking one. The question isn't which one is better. It's which one fits each type of customer you bill.
If you're trying to decide between the two because one of them isn't performing the way you expected, the likely issue isn't the tool itself. It's that it's being applied to the wrong segment of your customer base.
What Is an Online Payment Portal?
An online payment portal is an account-based payment system. The customer logs in with a username and password, can view their invoice and payment history, and can save a payment method or enroll in AutoPay. It's built for business relationships that continue over time.
Online payment portals work well when a customer:
- Bills with you regularly enough that account setup is worth the effort.
- Wants visibility into invoice and payment history.
- Benefits from saved payment methods or automated recurring payments.
What Is Pay-by-Link?
Pay-by-link (sometimes called guest checkout) is a payment method built around a single transaction. Instead of logging into an account, the customer receives a secure payment link tied to a specific invoice(s). They click it, land on a guest checkout page, enter payment details, and submit payment. No account is needed.
Pay-by-link works well when a customer:
- Buys from you once or infrequently.
- Needs to pay quickly without navigating a payment portal they'll likely never use again.
- Doesn't have, or doesn't want, an ongoing account relationship.
Pay-by-Link vs. Online Payment Portal
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Built for |
Ongoing account relationships |
Single, one-time transactions |
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Login required |
Yes |
No |
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Invoice history visible to customer |
Yes |
No |
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Saved payment methods / AutoPay |
Yes |
No |
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Setup effort for the customer |
Account creation |
None |
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Best fit |
Repeat, recurring customers |
One-time buyers and COD accounts |
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Typical use case |
Weekly and monthly billing |
Collections reminders, one-off invoices, first-time payments |
Why Businesses Get This Decision Wrong
The most common mistake isn't choosing the wrong tool. It's choosing only one tool for an entire customer base that actually needs both.
A business that routes every customer through an online payment portal will see strong adoption among recurring accounts and weak adoption among occasional buyers, who abandon the process rather than create an account for a single payment. A business that only offers pay-by-link, on the other hand, loses account history, saved payment methods, and AutoPay convenience that recurring customers want.
Neither failure means the tool was wrong. It means the tool was mismatched to the customer.
A Framework for Deciding Which Customers Go Where
Rather than asking "portal or pay-by-link," ask this about each segment of your customer base:
1. How often does this customer pay you? Monthly or more: portal. A few times a year or less: pay-by-link.
2. Does this customer benefit from seeing invoice history or enrolling in AutoPay? If yes, they're a portal candidate. If the value of an account doesn't outweigh the effort of creating one, pay-by-link is the better fit.
3. Is this a new customer without an established account yet? New customers, especially those who owe a first invoice or deposit before onboarding is complete, are almost always better served by pay-by-link.
4. Does this customer's payment come from someone other than the account holder? A family member paying a resident's move-in fee, a one-time payer on an insurance claim, someone paying on behalf of a business they don't have login access to. These situations call for pay-by-link regardless of how often the underlying account bills.
Real-World Scenarios
A wine distributor billing a restaurant twice a year. The restaurant doesn't want to create a portal account it will use twice annually. A pay-by-link option, attached directly to the invoice, gets it paid faster with no friction on either side.
A senior-living company collecting a move-in fee. The fee is often paid by a family member, not the resident whose account it's tied to. That person has no reason to create a resident portal account. A one-time payment link solves this cleanly.
A SaaS company billing monthly subscriptions. These customers benefit from a portal: they can see invoice and payment history, update a payment method, and never have to think about payment again after AutoPay is set up.
An insurance agency handling a single title closing. The buyer pays once and is gone. Attaching a payment link to the closing documents avoids walking a one-time payer through an online payment portal account setup they'll never use again.
Implementation Considerations
You don't have to choose separate providers. The most effective setup routes different customer segments to different experiences: an online payment portal for recurring accounts, pay-by-link for occasional ones, on the same underlying payment platform.
Security shouldn't differ between the two. Both should run on PCI-compliant infrastructure. A pay-by-link option is not, by definition, less secure than an online payment portal; it's simply built for a different kind of transaction.
Payment method coverage matters for both. Card, ACH, and EFT support should be available regardless of which experience a customer is routed through.
Cash application needs to be automated either way. Whether a payment comes through an online payment portal or a pay-by-link, it should post back into your AR system and back-office platform without manual matching. Otherwise, you've solved the customer's friction but not your finance team's.
What Mistakes Should You Avoid?
Treating this as an either-or decision. As covered above, most B2B businesses with a mixed customer base need both.
Assuming pay-by-link is only for small transactions. Pay-by-link works for any transaction size where the customer relationship is one-time or infrequent, not just small dollar amounts.
Forgetting that a regular portal customer can still receive a pay-by-link. A recurring account can still get a one-time payment link on a specific invoice, in a collections reminder, for example, without it replacing their portal account.
Rolling out pay-by-link without automating what happens after payment. If someone on your team still has to manually reconcile these payments, the operational burden hasn't gone away; it's just moved.
Where AR Automation Fits
AR automation platforms support both solutions side by side. The ETran AR automation platform accepts, processes AND posts any payment type—check, single/recurring ACH/EFT, credit/debit card, cash—via any payment channel—mailed-in, lockbox, called-in, in-person, online, mobile—on a single, secure (and compliant), SaaS platform.
ETran's online payment portal gives your recurring accounts the login, invoice history, and AutoPay experience they expect.
DirectPay, ETran's guest-checkout module, generates a secure, one-time payment link directly from any invoice, so occasional buyers, COD accounts, and new customers can pay without ever creating an account.
Both run on the same PCI-compliant infrastructure and integrate (batch or real-time) with any back-office system and work with your existing banking and merchant processor relationships
Key Takeaways
- Online payment portals and pay-by-link solve different problems: portals serve ongoing account relationships; pay-by-link serves one-time and occasional transactions.
- The most common mistake is treating this as a single, business-wide choice rather than segmenting customers and offering both.
- New customers, COD accounts, and payers who aren't the account holder are almost always better served by pay-by-link.
- Recurring, high-frequency customers get more value from a payment portal's invoice history and AutoPay features.
- Both approaches should run on the same secure infrastructure and post payments automatically, regardless of which one a customer uses.
Frequently Asked Questions
What's the difference between pay-by-link and a payment portal?
A payment portal requires an account and is built for customers who bill with you regularly. Pay-by-link uses a one-time secure link tied to a single invoice and requires no account at all.
Which one is more secure?
Both should run on PCI-compliant infrastructure. Removing the login requirement in pay-by-link doesn't remove security controls.
Can I offer both to the same customer?
Yes. A recurring portal customer can still receive a one-time pay-by-link, such as a collections reminder, without it replacing their account.
Is pay-by-link only useful for small invoices?
No. It's suited to any transaction, regardless of the dollar amount.
Do I need different platforms to offer both?
An AR platform like ETran, supports both an online payment portal and a guest-checkout, pay-by-link option side by side, on the same infrastructure.
How do I decide which customers should use each option?
Start with payment frequency. Customers who bill monthly or more are typically better served by a payment portal. One-time buyers, COD accounts, and new customers are typically better served by pay-by-link.
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The choice between pay-by-link and a payment portal isn't really a choice at all for most B2B businesses. Figure out which customers benefit from an ongoing account and which ones just need a fast, secure way to pay.