@JsonIgnore
    @CanIgnoreReturnValue
    public PasswordlessAuthenticationToken property(final String key, final String value) {
        this.properties.put(key, value);
        return this;
    }
Add property.

@param key   the key
@param value the value
@return the passwordless authentication token
support/cas-server-support-passwordless-api/src/main/java/org/apereo/cas/impl/token/PasswordlessAuthenticationToken.java