reCAPTCHA has 11 levels for scores with values ranging from 0.0 to 1.0. The score 1.0 indicates that the interaction poses low risk and is very likely legitimate, whereas 0.0 indicates that the interaction poses high risk and might be fraudulent. Out of the 11 levels, only the following four score levels are available before triggering an automatic security review by adding a billing account to your project: 0.1, 0.3, 0.7, and 0.9.
