in aws-codepipeline-server/src/main/java/jetbrains/buildServer/buildTriggers/codepipeline/CodePipelineAsyncPolledBuildTrigger.java [146:150]
private Map<String, String> validateParams(@NotNull Map<String, String> params) throws BuildTriggerException {
final Map<String, String> invalids = ParametersValidator.validateSettings(params, false);
if (invalids.isEmpty()) return params;
throw new BuildTriggerException(CodePipelineUtil.printStrings(invalids.values()), null);
}