- Short answer
- Shopify refers you to Fiskaly, whose guide names the TSE view of its dashboard; ELSTER's serial field needs all 64 hex characters, not the BSI ID.
- Fiskaly dashboard field
- “Serien Nr. des Zertifikats” in the TSE detail view — despite “Zertifikat”, the TSE serial, not the BSI ID.
- On the receipt
- German law requires the TSE serial on receipts: readable, in a QR code or in an e-invoice.
- Format for the notice
- 64 hexadecimal characters, 0–9 and A–F only; not Base64, not shortened.
- The app's XML declaration
- No Shopify page we read on September 27, 2026 says whether it names the serial as a field.
Where does Fiskaly show the TSE serial number?
Shopify's TSE help page sends you to Fiskaly, its third-party cloud TSE provider:
The TSE serial number is different from the BSI certification ID. If you need to find your TSE serial number, then refer to Fiskaly's guide on finding the TSE serial number.
Fiskaly's guide (in German) puts it in the TSE detail view of the fiskaly Dashboard, in the field “Serien Nr. des Zertifikats”. Despite “Zertifikat” in the label, it is the TSE serial, not the BSI ID.
Can you get the TSE serial from a receipt or an export?
German law requires a receipt to carry the serial number of the certified technical security device: readable by anyone, in a QR code or in an e-invoice. With TSE activated, Shopify prints TSE information on POS receipts; where a receipt carries a QR code, Fiskaly says its fiskalcheck app reads the serial from it.
Shopify's TSE app also offers “the complete DSFinV-K” export. Per Germany's finance ministry (BMF), a DSFinV-K export keeps the serial in “Stamm_TSE/tse.csv”, field “TSE_SERIAL”.
How do you enter the TSE serial in the ELSTER notice?
In its answer on updating the notice (Mitteilung) under §146a(4) AO after a TSE change, the BMF names four TSE details: the “Seriennummer der TSE”, the BSI certification ID, the commissioning date and the TSE type or model.
Enter the serial as 64 characters of hexadecimal code: 0–9 and A–F only, not Base64 with signs such as “=”, and not shortened.
No Shopify page we read on September 27, 2026 — the TSE help page or the app's App Store listing — says whether the app's XML declaration names the serial as a field; the help page describes “metadata regarding the technical security systems”.
Shopify says the app exports that XML declaration “to submit to German tax authorities”, and the BMF lists an XML upload in Mein ELSTER beside direct entry in the form. Neither page, read the same day, says the file replaces typing the serial — keep it at hand.
This article was written entirely by AI under human editorial direction. The editor sets the topic and structure, runs multi-stage validation on facts, links, and interactive elements, and verifies the output is useful from a business perspective. All claims are checked against official Shopify sources. Details may change — always confirm critical data at shopify.com.
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