100 percent
Print at original size.
Preserve the dimensions, contrast and readability of the Swiss QR Code.
Create QR invoiceDo not alter payment-part dimensions or placement.
The Swiss QR Code must be sharp and complete.
Print at original size.
Black code on white.
Follow perforation or cut-mark rules.
Print without scaling.
Scan with banking apps.
Compare captured data.
Not arbitrarily.
Postal documents must be separable as specified.
Keep the code black with sufficient contrast.
Specialist source: SIX – Swiss Payment Standards. This is general information, not tax or legal advice.