Initial version of the E-Invoice solution of JR IT Services

presets/customers.yaml

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+# Customer presets used by `jr-einvoice init --customer <name>`
+# Prefer file presets/customers/<key>.yaml if present; fallback to this file.
+# Keys are case-insensitive lookups (we normalize to lowercase).
+customers:
+  unicredit:
+    buyer:
+      name: "UniCredit"
+      vat_id: null
+      address:
+        street: "Platz der Republik 1"
+        postal_code: "00000"
+        city: "Ort"
+        country: "DE"
+    meta:
+      notes: "Bitte Rechnungsnummer im Betreff angeben."

presets/customers/unicredit.yaml

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+buyer:
+  name: "UniCredit"
+  vat_id: null
+  address:
+    street: "Platz der Republik 1"
+    postal_code: "00000"
+    city: "Ort"
+    country: "DE"
+meta:
+  notes: "Bitte Rechnungsnummer im Betreff angeben."

presets/seller.default.yaml

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+# Default seller settings used by `jr-einvoice init` (edit to your real data)
+seller:
+  name: "JR IT Services"
+  vat_id: "DE123456789"
+  tax_number: "123/456/78901"
+  email: "johannes@jr-it-services.de"
+  address:
+    street: "Musterstraße 1"
+    postal_code: "80331"
+    city: "München"
+    country: "DE"
+
+payment:
+  iban: "DE02120300000000202051"
+  bic: "BYLADEM1001"
+  bank_name: "Musterbank"