You have a new customer. They want your help. That should be the easy part.
But before the work starts, there is often a surprising amount of administration: emails, available dates, payment details, reminders and checking whether the money has arrived.
Last thing you want your customer to do is to stop him from paying.
If you sell consultations or other professional services online, there are three common ways to get paid:
Send an invoice.
Send a payment link.
Let the customer book and pay online in one process.
All three can work. The right choice depends on what you sell, how often you sell it and how much manual work you want around every transaction.
Send an invoice
This is the traditional process. You agree on the service and price, collect the customer’s billing details, prepare an invoice and send it by email. The customer then makes a bank transfer.
When does an invoice work well?
An invoice is often the right choice when:
• The scope or price is different for every customer.
• You deliver larger B2B projects.
• The customer needs an invoice before payment.
• The work is billed in stages or after delivery.
• Payment terms must be agreed individually.
For complex or high-value services, this flexibility matters. A proposal, contract and invoice can be more appropriate than an instant online purchase.
Where does the friction appear?
The downside is the amount of manual coordination involved.
You may need to ask for company details, create the invoice, send it, wait for payment and follow up. The customer must open their banking app, copy the account number and complete the transfer. If a meeting is involved, you still need to arrange a suitable time separately.
None of these steps is difficult. Together, however, they create delays for the customer and repetitive administration for you.
Best for: custom projects, larger B2B engagements and services with individual pricing.
2. Send a payment link
A payment link lets the customer pay online without making a traditional bank transfer. You create a link for a defined amount and send it by email, message or chat. The customer opens the page and pays using an available online payment method.
When does a payment link work well?
Payment links are useful when:
• The service and price are already agreed.
• You want to collect payment before starting.
• The customer asks for a fast way to pay online.
• You make occasional sales and do not need a complete booking system.
• You need a simple alternative to sending bank details.
Compared with a manual invoice and transfer, a payment link can make the final step much easier. It is especially useful for a one-off workshop, consultation, deposit or small fixed-price service.
What doesn’t a payment link solve?
A payment link improves payment, but it does not necessarily improve the entire customer journey.
You may still need to exchange emails, find an available date, add the appointment to your calendar, collect the customer’s information and send confirmation manually.
You may also have separate tools for your website, calendar, payments, customer records and invoicing. The payment is faster, but the surrounding process can remain fragmented.
Best for: occasional, fixed-price services when the date or details are agreed separately.
3. Let the customer book and pay online
In an automated booking process, the customer selects a service, sees your available time slots, chooses a date and pays upfront. The appointment is confirmed after all the required steps are complete.
This turns several separate tasks into one customer journey:
Choose a service → select a time → enter your details → pay → receive confirmation
Your calendar is updated, the customer receives the booking information and you can see who purchased what—without arranging everything manually by email.
When does online booking with payment work well?
This model is particularly effective when:
• You sell consultations, sessions, audits or appointments.
• The service has a clear duration and price.
• Customers can choose from predefined time slots.
• You repeat the same sales process regularly.
• You want payment before reserving your time.
It can work well for accountants, lawyers, business consultants, coaches, designers, architects and other professionals who sell access to their expertise.
Why do customers often prefer it?
Customers do not have to wait for a reply just to discover when you are available. They can make a decision and complete the booking when it suits them—even outside your working hours.
They also see the price and the next steps before confirming. A well-designed process gives them immediate certainty: the appointment is booked, the payment is complete and the confirmation is in their inbox.
Why is it better for the service provider?
Upfront payment reduces the need to chase payments after the work. Calendar synchronisation prevents customers from selecting times when you are unavailable. Automatic confirmations reduce repetitive messages, while the customer and booking information stays connected.
Most importantly, you spend less time coordinating the sale and more time delivering the service.
Best for: repeatable, time-based services with a defined price and duration.
Invoice, payment link or paid online booking—which is best?
An invoice is best for custom projects and individual pricing. It offers flexibility, but usually involves the most manual work for you and your customer.
A payment link is a good option for occasional, fixed-price services. It simplifies the payment, but you may still need to arrange the appointment and manage customer information separately.
Online booking with payment is usually the best option for repeatable consultations and appointments. It combines scheduling, payment and confirmation in one process, reducing the amount of work required on both sides.
Which payment method should you choose?
For custom projects, sending an invoice may still be the best option. When the scope, price and terms require discussion, automation should not replace a necessary sales conversation.
For an occasional fixed-price sale, a payment link is a useful middle ground. It makes payment easier without requiring you to redesign the full process.
But if you regularly sell a clearly defined consultation or appointment, online booking with upfront payment is usually the best experience for both sides.
Your customer gets speed, clarity and control. You receive payment before the meeting, have fewer administrative tasks and keep your calendar updated automatically.
The best solution can also be a combination of all three methods:
• Automated booking and payment for standard consultations.
• Payment links for one-off services.
• Proposals and invoices for larger, custom projects.
The goal is not to force every customer into the same process. It is to make simple sales simple—and keep personal attention for work that actually needs it.
A payment button alone is not a process
Many small service businesses already use several digital tools. They have a website, a calendar, email, online payments and perhaps a spreadsheet or CRM.
The problem is that these tools often do not work together.
A customer submits a form, but the details remain in an inbox. A meeting is booked, but the payment must be checked separately. An invoice is created in another system. Follow-up depends on someone remembering to send it.
The bigger improvement comes from connecting the complete journey:
Website → booking → calendar → payment → customer record → confirmation
That is the process MATERP is designed to provide: one connected setup for professionals who want to turn enquiries into paid appointments without email back-and-forth.
Make it easier for customers to buy your time
If your service has a clear price and duration, customers should not need several emails just to buy it.
MATERP connects your website, booking calendar, online payment and customer information in one practical process—so customers can book and pay while you stay focused on the actual work.
Want to see how this could work for your business? Book a free consultation with me!
Frequently asked questions
Should I ask customers to pay before a consultation?
For a clearly defined consultation, upfront payment is often the simplest model. The customer confirms the purchase when booking, while you avoid delivering the service before knowing whether the payment will arrive. Your payment and cancellation terms should be visible before checkout.
Can I still issue an invoice when a customer pays online?
Yes. Online payment and invoicing are different parts of the process. A connected system can record the transaction and support the relevant sales and invoicing workflow. The exact accounting and tax setup should follow the rules applicable to your business and country.
Is online booking suitable for every professional service?
No. It works best for services with a defined price, duration and outcome. Larger or more complex projects usually require a conversation, proposal and individual quotation first.
Do I need separate tools for my website, calendar and payments?
Not necessarily. A connected business system can bring these elements into one workflow. Odoo, for example, supports online appointments and payments and can synchronise meetings with Google Calendar.
What is the easiest way to start accepting payments online?
If you only need to collect an occasional payment, start with a payment link. If you regularly sell scheduled sessions, a booking process with integrated upfront payment will usually save more time in the long run.