Integrations

Connect an external service to issue compliant invoices. The Issuer 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 Issuer is active per Stripe account.

Dashboard: Settings → Payments & Tax → Invoicing integrations

Available Issuers

Issuer	Country	Status
Stripe Invoicing	Wherever your Stripe account invoices	Available
Fakturownia	PL invoices	Available
Billit	BE · NL · DE · FR · IT · PL invoices	Available

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 Issuer gives you both: Onelo computes the VAT, your Issuer issues the official document.

Connect an Issuer

Pick a card

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

Fill in the fields it asks for

Each Issuer asks for what it needs — an account identifier and an API token, or a single Connect button when it authorises by OAuth. The form is drawn from the Issuer itself, so you are never asked for a value it does not use. Credential fields are stored encrypted; once saved they show “•••••• (stored — leave blank to keep)”. Where to find those values inside your Issuer's own account is in that Issuer's documentation.

Click Save & set active

The Issuer becomes the active one for this Stripe account, and — where it keeps the seller in its own account — Onelo configures your seller details there from your Company details.

WhereDashboard→Settings→Payments & Tax→Invoicing integrations

Click the Issuer's card, fill the fields it asks for, then click Save & set active. Where the Issuer holds the seller, a “✓ Seller auto-configured” status appears above the Save button after saving.

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 the Issuer automatically (and keeps a separate seller profile ready for UK VAT when you are registered with a GB number), so the invoice header can never drift out of date.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 seller profile did not sync — save again.
“⚠ Couldn't auto-configure the seller…”	Check the company data and bank-account settings in your Issuer, 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 Issuer, 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 → your Issuer issues the invoice with the right rate, your numbers and any legal clause → the buyer receives it. Refunds issue a corrective document in the same system.