Unit 11 · Ship AI systems you can operate

Route webhooks through the same event runtime

You route authenticated webhooks, timers, queues, and application events through AxEventRuntime. UCP commerce events use the same explicit wake and resume policy.

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Worked example

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Response handleUCPWebhook(Request request) {
  // Verify signer profile, RFC 9421 signature, digest, freshness,
  // key rotation, and replay state before publishing.
  VerifiedOrder order = verifyUCPRequest(request);
  String identity = lookupBuyerIdentity(order.checkoutId());
  runtime.publish(
      new AxEventEnvelope(order.id(), "ucp://orders",
          "ucp.order.fulfilled", order.data()),
      identity, "authenticated");
  return new Response(202);
}

Run itIn your own project

// Gradle (build.gradle):
implementation 'dev.axllm:ax:22.0.4'
// Maven (pom.xml):
<dependency>
  <groupId>dev.axllm</groupId>
  <artifactId>ax</artifactId>
  <version>22.0.4</version>
</dependency>

import dev.axllm.ax.Ax;

var llm = Ax.ai("openai", Map.of("apiKey", System.getenv("OPENAI_API_KEY")));
var classify = Ax.ax("review:string -> sentiment:class \"positive, negative, neutral\"");

Set OPENAI_APIKEY in your environment before running provider-backed code.

In the ax repo

From a clone of the ax repo:

npm run example -- java src/examples/java/long-agents/SmartDefaultsAgentExample.java

Active practice

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