Interface QrHelperOptions

Error correction level. Use the QR_ECLEVEL_* constants from ../constants.

• QR_ECLEVEL_L = 0 — roughly 7 % correction (default)
• QR_ECLEVEL_M = 1 — roughly 15 % correction
• QR_ECLEVEL_Q = 2 — roughly 25 % correction
• QR_ECLEVEL_H = 3 — roughly 30 % correction

QR model constant. Use the QR_MODEL_* constants from ../constants.

• QR_MODEL_1 = 1
• QR_MODEL_2 = 2 (default; most widely supported)
• QR_MICRO = 3

Module size (pixel width per cell), 1–16. Defaults to 3.