Last updated: 1 August 2026
These terms govern your use of Rechna, the e-invoicing app for Shopify. Installing or using the app means you accept them.
Rechna is operated by:
Rechna turns your paid Shopify orders into invoices — including EN 16931 e-invoice formats (ZUGFeRD, XRechnung) — numbers them gaplessly, archives them immutably for the statutory retention period, and can email them to your customers. It is deliberately narrow: it issues and archives invoices, nothing else.
Rechna is software. It applies the rules you configure and the data your store provides; it does not know your tax situation and does not give tax or legal advice. You remain responsible for the correctness of your tax setup, your seller details, and your legal obligations. Discuss your configuration with your tax advisor (Steuerberater).
If an order lacks something a compliant invoice needs — a resolvable tax rate, a buyer address, your seller identity — Rechna refuses to issue and tells you why, instead of guessing. A refusal is a feature, not a defect. You are responsible for completing the missing data.
Rechna offers a Free plan and paid plans (Standard, Compliance), billed through Shopify Billing on your Shopify invoice, in the amounts and intervals shown in the app when you subscribe. Paid plans include a 14-day free trial; cancel during the trial and you are not charged. We do not see or store your payment details. Prices may change with notice; a change never applies to a period you have already paid for.
Issued invoices are stored write-once (S3 Object Lock, compliance mode) and retained for the statutory period (§147 AO, §14b UStG — currently 8 years). Neither you nor we can alter or delete them during that period; corrections happen only through cancellation (Storno) or credit note (Gutschrift). Uninstalling the app does not delete the archive before the period ends. You can export your archive (ZIP with CSV index) at any time on plans that include export — do this before uninstalling if you want a local copy.
Use Rechna only for stores you own or are authorised to manage, and only for genuine transactions. Do not attempt to break, overload, reverse-engineer, or resell the service. We may suspend access that threatens the service or other merchants.
We operate the service with care — validation against the official KoSIT validator and veraPDF is built into issuance — but no software is guaranteed error-free. To the extent permitted by law, our liability is limited to intent and gross negligence, and for slight negligence to the breach of essential contractual duties, capped at the fees you paid in the twelve months before the event. We are not liable for tax assessments, penalties, or interest resulting from data you provided or configuration you chose.
The contract runs while the app is installed. Uninstall at any time; paid periods already started are not refunded. Section 5 (archive) survives termination for the statutory retention period.
Swiss law applies, excluding its conflict-of-law rules; mandatory provisions of the law of your place of business remain unaffected. Place of jurisdiction is Lugano, Switzerland.
We may update these terms with notice in the app. Continued use after the notice period means acceptance.