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+* Implement the `ChallengeProvider` interface, which contains these methods:
+
+  * `getId()` - needs to return a string that will be used to identify the provider itself.
+  * `returnChallenge()` - needs to return a new CAPTCHA challenge, for the configured parameters
+  * `checkAnswer()` - check whether than answer is correct
+  * `configure()` - (optional) use the supplied configuration
+  * `supportedParameters` - (optional) a map of parameters and their accepted values 
+
+* For inspiration, see the sample providers. `FilterChallenge` is simple and a good starting point.
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