The dimensions that the thermal paper needs to be in, or alternatively, the thermal printing tape, vary depending on the model of the card terminal.
Specifically:
Card terminal model | Width | Diameter |
A80 | 58 mm | 50 mm |
A920pro, A920, A910 | 58 mm | 40 mm |
S900 | 58 mm | 40 mm |
S800 | 58 mm | 50 mm |
Viva Wallet Contactless Terminal powered by Google Play | 58 mm | 40 mm |
Viva Wallet Contactless Terminal with Professional Scanner powered by Google Play | 58 mm | 40 mm |
Viva Wallet Contactless / Chip & PIN Terminal powered by Google Play | 58 mm | 40 mm |