Integrations

Connect an external service to issue compliant invoices. The provider receives the ready-made VAT split from your tax engine — it never recomputes tax — and turns it into a legally valid national invoice, delivered to your buyer. One provider is active per Stripe account.

Dashboard: Settings → Payments & Tax → Invoicing integrations

Available providers

Provider	Country	Status
Fakturownia	Poland · PL invoices (KSeF-ready)	Available
inFakt	Poland · PL invoices	Coming soon
wFirma	Poland · PL invoices	Coming soon

Why connect one at all? Stripe's receipts and invoices are fine for many sellers — but some countries require invoices in a national system (Poland's KSeF e-invoicing, for example), and many accountants simply work in these tools. A connected provider gives you both: Onelo computes the VAT, your provider issues the official document.

Connect Fakturownia

Pick the Fakturownia card

On the Integrations page, select Fakturownia. Cards show “● Connected” / “○ Not connected” at a glance.

Enter two values

Account subdomain — the mycompany part of mycompany.fakturownia.pl — and your API token (Fakturownia → Settings → API). The token is stored encrypted; once saved, the field shows “•••••• (stored — leave blank to keep)”.

Click Save & set active

Fakturownia becomes the active invoice issuer for this Stripe account, and Onelo auto-configures your seller details in Fakturownia from your Company details.

WhereDashboard→Settings→Payments & Tax→Invoicing integrations→Fakturownia

Click the Fakturownia card, fill Account subdomain and API token, then click Save & set active. After saving, the green “✓ Seller auto-configured” status appears above the Save button.

One source of truth for your seller data. Your name, address and tax number on invoices come from Settings → Payments & Tax → Company / Invoice — not from this page. Onelo syncs them to Fakturownia automatically (and keeps a separate UK department ready when you’re registered for UK VAT (GB number)), so the invoice header can never drift out of date.

After saving, one status line tells you where you stand:

Status	Meaning / what to do
“✓ Seller auto-configured from Company details”	Done — invoices will carry your current company data. If you are registered for UK VAT it also reads “· UK department ready for B2C UK (GB)”; when that half is missing, the UK department did not sync — save again.
“⚠ Couldn't auto-configure the seller in Fakturownia…”	Check your Fakturownia company data and bank-account security level, then save again.

How it fits together

Page	Role
Tax Setup	Your registrations & reach — determines the VAT on each sale.
Tax & Invoicing	Where you choose External integration as the invoice issuer.
Integrations (this page)	Which provider, and its credentials.
Settings → Payments & Tax → Company / Invoice	Your seller identity, synced onto every invoice.

From the buyer's side: they pay at checkout → VAT is computed by your engine → Fakturownia issues the invoice with the right rate, your numbers and any legal clause → the buyer receives it. Refunds issue a corrective invoice (korekta) in the same system.