What Is The End User Experience of Invoicing APIs (For Your Platform and Clients)
You add invoicing to your platform. Great. But your users don’t care about technical specs…they care about why they should use it. Why invoice through you, and not their accountant or some app they already trust?
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To your clients, invoicing isn’t a back-end tool. It’s a brand experience. The key to adoption? White-labelling the invoicing feature so it looks and feels native. No confusion, no friction—just fast onboarding, professional results, and one less reason for your clients to ever leave your platform.
You Integrated Invoicing Feature. What Now?
For your platform, the experience depends on how and which invoicing API you integrate—but the core benefit is clear: you can offer fully functional invoicing without building it from scratch. You can also use it for your own invoicing needs, simplifying operations internally.
Now, when you offer invoicing to your clients, the real question becomes: ‘’Why should they invoice through you?’’
It’s about convenience and trust. You’ve already solved problems for them, and now you’re offering a solution within the same platform. That means no new tools, no learning curve, and no added complexity. To the end user, it presents:
So what does the actual experience look like?
White-Label The Feature! For The User…
The first step is white-labelling the invoicing feature, not for your sake, but for your users. They trust your platform, not random third-party tools.
Seeing unfamiliar branding can raise their doubts, trigger security concerns, and make them question the quality of your entire service. Even if you white-label the feature, it is still a third party feature, but it creates a seamless, consistent experience inside the platform they already know.
It looks native and professional, and that’s all your users care about.
Quick, Automatic On-Boarding
Let’s say your client has the budget. On paper, developing or integrating a custom invoicing API seems reasonable. But in reality, it would take more than a year to build, and that’s before even dealing with compliance. Each country has its own tax rules, invoice formats, and legal obligations.
Meanwhile… they’re already on your platform.
One day they log in and see that invoicing is available. They've been looking for a solution, so they click. They discover they can:
And they can start instantly, as the feature is streamlined. No onboarding friction, they don’t even need to talk or register to you (again).
The Client Is Ready To Start Invoicing… How To Create an Invoice?
Your user signs in to your platform. In the menu, they find a dedicated “Invoices” or “Billing” section. To get started, they have to onboard once, by entering business details like VAT number or company ID and completing identity verification (if required by the government).
They decide to create an invoice. It feels familiar to normal invoicing, as all they have to do is add the customer, line items, taxes, and any notes. Click ‘’send’’.
Behind the scenes, the API converts it into a machine-readable e-invoice (usually in XML format), digitally signs it, and sends it through the required e-invoicing network (e.g., Peppol or a government portal).
For automatic invoicing, users can preload their services, pricing, tax rules, and client data. Then, the platform automatically triggers invoice creation when:
The API pulls structured data, generates the invoice, and sends it—with zero user action.
This is especially valuable for e-commerce and digital platforms, where transactions happen online and all the needed data is already captured at checkout.
How Does an E-invoice Get Paid… Can Users Track It?
Users can track every stage of the invoicing process directly inside your app. They see when the invoice is submitted, validated, rejected by the authority, delivered to the customer, and even paid, if payment tracking is enabled.
When the recipient receives the e-invoice, their system validates it for format and compliance. Once accepted, one of two things happens:
Payment is processed via the buyer’s bank or gateway. It can be embedded directly in the invoice using a QR code or payment link, or handled through traditional bank transfers using the provided IBAN/SWIFT details.
Once payment is completed, a real-time confirmation is sent back to the seller’s system.
Invoice Branding, Payment Links And Extra Features.
Depending on the invoicing API you choose, your users can access a variety of valuable feature, with two of the most common being payment links and invoice brand customization.
Most APIs allow users to customize the look of their invoices. They can typically choose from legally compliant templates, upload their own logo and set brand colors, all to maintain a consistent visual identity.
Payment links are often automatically generated, but you’ll need to enable this feature. These links can direct to card payments, SEPA, or other gateways.
Additional features may include:
The more flexible the API, the more tailored and seamless the experience you can offer your users.
Are Your Clients Ready For an Invoicing Upgrade?
At Space Invoices, we got you. We build a modern invoicing API for SaaS, neobanks, fintech, e-commerce, and platform-based SMBs. We provide comprehensive developer documentation and fair, transparent pricing designed to grow with your business.
With Space Invoices, you can:
Have questions about integrating invoicing into your product?
We’re ready to help.
Additional reading:
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