How Stripe-Style API Versioning in Quarkus Saves Your Demos and Your Sanity

A practical, end-to-end guide to building date-based API adapters, version routers, and backward-compatible responses in modern Java.

Dec 10, 2025

Not long ago, I was preparing a demo for a conference. The demo relied on an internal API one of my DevRel colleagues had built. We use each other’s services all the time; it’s part of the fun of working in a team where everyone experiments and ships small ideas quickly.

Except on that particular morning, the API had changed.
Not dramatically. Not maliciously. Just enough that the request my demo was sending no longer matched what the service expected. A field had been renamed. Another one removed.

Meanwhile, I was staring at a broken demo, wondering when the change happened and why nobody had mentioned it in the chat.

It wasn’t anyone’s fault, really.
It was just version drift.
The silent killer of demos, integrations, and the occasional developer mood.

That moment reminded me of something Stripe figured out early on: if you want to keep evolving an API without breaking people downstream, the API must never implicitly change. Clients should opt into new behavior. Not discover it during a live demo.

That’s what this article is about.

Quarkus gives us everything we need to build a Stripe-style versioning model: Date-based versions, clean adapters, a stable canonical model, and request/response transformation pipelines that let your API evolve safely for years. In this tutorial, we’ll build a fully runnable example that shows how to do exactly that.

Because if there’s one thing better than a fast, modern Java stack, it’s a future version of your API that doesn’t sabotage your demo five minutes before you go on stage.

What you’ll build

A minimal Payments API with three schema generations:

V1 (2023-10-16): { “amount”: 100.00 }
V2 (2024-03-15): { “amount”: 100.00, “method”: “CARD” }
V3 (2024-09-01): adds async confirmation fields in the response

Adapters translate each version to/from a CanonicalPayment model used by the service.

Project bootstrap

mvn io.quarkus.platform:quarkus-maven-plugin:create \
  -DprojectGroupId=com.example \
  -DprojectArtifactId=api-adapter-demo \
  -DclassName="com.example.api.PaymentResource" \
  -Dpath="/payments" \
  -Dextensions="rest-jackson,smallrye-openapi,hibernate-validator"
cd api-adapter-demo

We explicitly use rest-jackson because the Quarkus REST stack was renamed; this is the current, stable path for JSON over HTTP in Quarkus. Don’t trust AI assistants wanting you to scaffold Quarkus apps with anything else.

If you don’t feel like following the steps in this tutorial, just take a look at the companion Github repository and grab it from there.

application.properties

src/main/resources/application.properties

quarkus.http.port=8080
# Default API version if client didn’t send X-API-Version:
api.default-version=2024-09-01

Version detection and routing

We’ll capture X-API-Version and store it in a request-scoped context. If missing, we use a configurable default (mimics “account default” in Stripe).

src/main/java/com/example/version/VersionContext.java

A @RequestScoped CDI bean that:

Holds the API version for the current request

Provides thread-safe access during request processing

Ensures each request has its own version context

package com.example.version;

import jakarta.enterprise.context.RequestScoped;

@RequestScoped
public class VersionContext {
    private String version;

    public String get() {
        return version;
    }

    public void set(String version) {
        this.version = version;
    }
}

src/main/java/com/example/version/ApiVersionFilter.java

A JAX-RS request filter that:

Reads the X-API-Version header from incoming requests

Falls back to a configurable default (api.default-version, defaulting to 2024-09-01)

package com.example.version;

import org.eclipse.microprofile.config.inject.ConfigProperty;

import jakarta.enterprise.context.ApplicationScoped;
import jakarta.inject.Inject;
import jakarta.ws.rs.container.ContainerRequestContext;
import jakarta.ws.rs.container.ContainerRequestFilter;
import jakarta.ws.rs.ext.Provider;

/**
 * Reads X-API-Version and stores it in VersionContext.
 */
@Provider
@ApplicationScoped
public class ApiVersionFilter implements ContainerRequestFilter {

    @ConfigProperty(name = “api.default-version”, defaultValue = “2024-09-01”)
    String defaultVersion;

    @Inject
    VersionContext ctx;

    @Override
    public void filter(ContainerRequestContext requestContext) {
        String v = requestContext.getHeaderString(”X-API-Version”);
        ctx.set(v != null && !v.isBlank() ? v : defaultVersion);
    }
}

Canonical model and service

Your canonical model is what the business logic understands. It should be free from versioning quirks.

src/main/java/com/example/domain/PaymentStatus.java

package com.example.domain;

public enum PaymentStatus {
    AUTHORIZED, CONFIRMED, PENDING, FAILED
}

src/main/java/com/example/domain/CanonicalPayment.java

package com.example.domain;

import java.math.BigDecimal;
import java.time.OffsetDateTime;

public class CanonicalPayment {
    public String id;
    public BigDecimal amount;
    public String method; // CARD, SEPA, PAYPAL, etc.
    public PaymentStatus status;
    public OffsetDateTime createdAt;

    public CanonicalPayment() {
    }

    public CanonicalPayment(String id, BigDecimal amount, String method,
            PaymentStatus status, OffsetDateTime createdAt) {
        this.id = id;
        this.amount = amount;
        this.method = method;
        this.status = status;
        this.createdAt = createdAt;
    }
}

src/main/java/com/example/service/PaymentService.java

Business logic:

create(CanonicalPayment req): Creates a payment

Generates a UUID, sets default method if missing, initializes status to AUTHORIZED

Works with the canonical model, not versioned DTOs

package com.example.service;

import java.time.OffsetDateTime;
import java.util.UUID;

import com.example.domain.CanonicalPayment;
import com.example.domain.PaymentStatus;

import jakarta.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class PaymentService {

    public CanonicalPayment create(CanonicalPayment req) {
        // In real life: fraud checks, ledger writes, async webhooks, etc.
        String id = UUID.randomUUID().toString();
        return new CanonicalPayment(
                id,
                req.amount,
                req.method == null ? “CARD” : req.method,
                PaymentStatus.AUTHORIZED,
                OffsetDateTime.now());
    }
}

Versioned DTOs

Define DTOs per version. Keep them small and explicit.

src/main/java/com/example/api/v1/PaymentV1.java

package com.example.api.v1;

import java.math.BigDecimal;

import jakarta.validation.constraints.DecimalMin;
import jakarta.validation.constraints.NotNull;

public record PaymentV1(
        @NotNull @DecimalMin(”0.01”) BigDecimal amount) {
}

src/main/java/com/example/api/v2/PaymentV2.java

package com.example.api.v2;

import java.math.BigDecimal;

import jakarta.validation.constraints.DecimalMin;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.NotNull;

public record PaymentV2(
        @NotNull @DecimalMin(”0.01”) BigDecimal amount,
        @NotBlank String method) {
}

src/main/java/com/example/api/v3/PaymentV3Response.java

package com.example.api.v3;

import java.math.BigDecimal;
import java.time.OffsetDateTime;

/**
 * V3 returns more metadata and async confirmation hints.
 */
public record PaymentV3Response(
    String id,
    BigDecimal amount,
    String method,
    String status,
    OffsetDateTime createdAt,
    boolean confirmationRequired
) {}

Adapter contracts and registry

Adapters translate between versioned DTOs and the canonical model.

src/main/java/com/example/adapter/RequestAdapter.java

Converts versioned requests to CanonicalPayment

version(): Returns the version date (e.g., “2023-10-16”)

requestType(): Returns the request DTO class

toCanonical(T request): Transforms to canonical model

package com.example.adapter;

import com.example.domain.CanonicalPayment;

public interface RequestAdapter<T> {
    String version(); // ex: “2023-10-16”

    Class<T> requestType(); // ex: PaymentV2.class

    CanonicalPayment toCanonical(T request);
}

src/main/java/com/example/adapter/ResponseAdapter.java

Converts CanonicalPayment to versioned responses

version(): Returns the version date

responseType(): Returns the response DTO class

fromCanonical(CanonicalPayment model): Transforms to versioned response

package com.example.adapter;

import com.example.domain.CanonicalPayment;

public interface ResponseAdapter<R> {
    String version();

    Class<R> responseType();

    R fromCanonical(CanonicalPayment model);
}

A small registry resolves adapters for a given date string. We’ll choose the closest adapter on or before the requested date. This is a pragmatic approach you can refine (e.g., map exact dates only).

src/main/java/com/example/adapter/AdapterRegistry.java

Discovers all adapters via CDI Instance injection

Selects adapters based on version and target type

Uses date-based version comparison (finds the latest adapter ≤ requested version)

Supports backward compatibility by selecting the most recent compatible adapter

package com.example.adapter;

import java.time.LocalDate;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;

import jakarta.enterprise.context.ApplicationScoped;
import jakarta.enterprise.inject.Instance;
import jakarta.inject.Inject;

@ApplicationScoped
public class AdapterRegistry {

    private final List<RequestAdapter<?>> requestAdapters;
    private final List<ResponseAdapter<?>> responseAdapters;

    @Inject
    public AdapterRegistry(Instance<RequestAdapter<?>> reqs, Instance<ResponseAdapter<?>> resps) {
        this.requestAdapters = reqs.stream().toList();
        this.responseAdapters = resps.stream().toList();
    }

    public <T> RequestAdapter<T> requestAdapterFor(String version, Class<T> targetTypeHint) {
        LocalDate v = LocalDate.parse(version);
        @SuppressWarnings(”unchecked”)
        Optional<RequestAdapter<T>> best = (Optional<RequestAdapter<T>>) (Optional<?>) requestAdapters.stream()
                .filter(a -> LocalDate.parse(a.version()).compareTo(v) <= 0)
                .sorted(Comparator.comparing(a -> LocalDate.parse(a.version()), Comparator.reverseOrder()))
                .findFirst();
        return best.orElseThrow(() -> new IllegalArgumentException(”No RequestAdapter for version “ + version));
    }

    public <R> ResponseAdapter<R> responseAdapterFor(String version, Class<R> targetTypeHint) {
        LocalDate v = LocalDate.parse(version);
        @SuppressWarnings(”unchecked”)
        Optional<ResponseAdapter<R>> best = (Optional<ResponseAdapter<R>>) (Optional<?>) responseAdapters.stream()
                .filter(a -> LocalDate.parse(a.version()).compareTo(v) <= 0)
                .sorted(Comparator.comparing(a -> LocalDate.parse(a.version()), Comparator.reverseOrder()))
                .findFirst();
        return best.orElseThrow(() -> new IllegalArgumentException(”No ResponseAdapter for version “ + version));
    }
}

Concrete adapters (V1, V2, V3)

src/main/java/com/example/adapter/v1/PaymentV1Adapter.java

package com.example.adapter.v1;

import java.math.BigDecimal;
import java.time.OffsetDateTime;

import com.example.adapter.RequestAdapter;
import com.example.adapter.ResponseAdapter;
import com.example.api.v1.PaymentV1;
import com.example.domain.CanonicalPayment;
import com.example.domain.PaymentStatus;

import jakarta.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class PaymentV1RequestAdapter implements RequestAdapter<PaymentV1> {
    @Override
    public String version() {
        return “2023-10-16”;
    }

    @Override
    public Class<PaymentV1> requestType() {
        return PaymentV1.class;
    }

    @Override
    public CanonicalPayment toCanonical(PaymentV1 request) {
        return new CanonicalPayment(
                null, // id created by service
                request.amount(),
                “CARD”, // default method in V1
                PaymentStatus.PENDING, // initial
                OffsetDateTime.now());
    }
}

@ApplicationScoped
class PaymentV1ResponseAdapter implements ResponseAdapter<PaymentV1> {
    @Override
    public String version() {
        return “2023-10-16”;
    }

    @Override
    public Class<PaymentV1> responseType() {
        return PaymentV1.class;
    }

    @Override
    public PaymentV1 fromCanonical(CanonicalPayment model) {
        // V1 only exposes amount back
        BigDecimal amt = model.amount == null ? BigDecimal.ZERO : model.amount;
        return new PaymentV1(amt);
    }
}

src/main/java/com/example/adapter/v2/PaymentV2Adapter.java

package com.example.adapter.v2;

import java.time.OffsetDateTime;

import com.example.adapter.RequestAdapter;
import com.example.adapter.ResponseAdapter;
import com.example.api.v2.PaymentV2;
import com.example.domain.CanonicalPayment;
import com.example.domain.PaymentStatus;

import jakarta.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class PaymentV2RequestAdapter implements RequestAdapter<PaymentV2> {
    @Override
    public String version() {
        return “2024-03-15”;
    }

    @Override
    public Class<PaymentV2> requestType() {
        return PaymentV2.class;
    }

    @Override
    public CanonicalPayment toCanonical(PaymentV2 request) {
        return new CanonicalPayment(
                null,
                request.amount(),
                request.method(),
                PaymentStatus.PENDING,
                OffsetDateTime.now());
    }
}

@ApplicationScoped
class PaymentV2ResponseAdapter implements ResponseAdapter<PaymentV2> {
    @Override
    public String version() {
        return “2024-03-15”;
    }

    @Override
    public Class<PaymentV2> responseType() {
        return PaymentV2.class;
    }

    @Override
    public PaymentV2 fromCanonical(CanonicalPayment model) {
        return new PaymentV2(model.amount, model.method);
    }
}

src/main/java/com/example/adapter/v3/PaymentV3Adapter.java

package com.example.adapter.v3;

import java.time.OffsetDateTime;

import com.example.adapter.RequestAdapter;
import com.example.adapter.ResponseAdapter;
import com.example.api.v2.PaymentV2; // V3 reuses V2 request but adds V3 response features
import com.example.api.v3.PaymentV3Response;
import com.example.domain.CanonicalPayment;
import com.example.domain.PaymentStatus;

import jakarta.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class PaymentV3RequestAdapter implements RequestAdapter<PaymentV2> {
    @Override
    public String version() {
        return “2024-09-01”;
    }

    @Override
    public Class<PaymentV2> requestType() {
        return PaymentV2.class;
    }

    @Override
    public CanonicalPayment toCanonical(PaymentV2 request) {
        return new CanonicalPayment(
                null,
                request.amount(),
                request.method(),
                PaymentStatus.PENDING,
                OffsetDateTime.now());
    }
}

@ApplicationScoped
class PaymentV3ResponseAdapter implements ResponseAdapter<PaymentV3Response> {
    @Override
    public String version() {
        return “2024-09-01”;
    }

    @Override
    public Class<PaymentV3Response> responseType() {
        return PaymentV3Response.class;
    }

    @Override
    public PaymentV3Response fromCanonical(CanonicalPayment model) {
        boolean confirmationRequired = model.status == PaymentStatus.AUTHORIZED;
        return new PaymentV3Response(
                model.id,
                model.amount,
                model.method,
                model.status.name(),
                model.createdAt,
                confirmationRequired);
    }
}

Resource: version-aware endpoint

We’ll accept generic JSON and let the registry pick the right request adapter based on the current version. Then we choose a response adapter for the same version so each caller gets the format they expect.

src/main/java/com/example/api/PaymentResource.java

package com.example.api;

import com.example.adapter.AdapterRegistry;
import com.example.adapter.RequestAdapter;
import com.example.adapter.ResponseAdapter;
import com.example.api.v1.PaymentV1;
import com.example.api.v2.PaymentV2;
import com.example.api.v3.PaymentV3Response;
import com.example.domain.CanonicalPayment;
import com.example.service.PaymentService;
import com.example.version.VersionContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import jakarta.inject.Inject;
import jakarta.validation.Valid;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;

@Path(”/payments”)
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class PaymentResource {

    @Inject VersionContext versionContext;
    @Inject AdapterRegistry registry;
    @Inject PaymentService service;
    @Inject ObjectMapper mapper;

    @POST
    public Response createPayment(@Valid JsonNode body) throws Exception {
        String version = versionContext.get();

        // Pick the best request adapter for this version.
        // We support V1 and V2 request shapes across all versions.
        RequestAdapter<?> reqAdapter = pickRequestAdapter(version);

        // Deserialize into the adapter’s expected request type
        Object typedReq = mapper.treeToValue(body, reqAdapter.requestType());
        CanonicalPayment canonical = adaptToCanonical(reqAdapter, typedReq);

        // Business logic
        CanonicalPayment created = service.create(canonical);

        // Transform response for the same version
        Object versionedResponse = pickAndTransformResponse(version, created);

        return Response.ok(versionedResponse).build();
    }

    // ---- Helpers

    private RequestAdapter<?> pickRequestAdapter(String version) {
        // Try V2 first (has method), fallback to V1
        try { return registry.requestAdapterFor(version, PaymentV2.class); }
        catch (Exception ignore) { /* fallback */ }
        return registry.requestAdapterFor(version, PaymentV1.class);
    }

   package com.example.api;

import com.example.adapter.AdapterRegistry;
import com.example.adapter.RequestAdapter;
import com.example.adapter.ResponseAdapter;
import com.example.api.v1.PaymentV1;
import com.example.api.v2.PaymentV2;
import com.example.api.v3.PaymentV3Response;
import com.example.domain.CanonicalPayment;
import com.example.service.PaymentService;
import com.example.version.VersionContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import jakarta.inject.Inject;
import jakarta.validation.Valid;
import jakarta.ws.rs.Consumes;
import jakarta.ws.rs.POST;
import jakarta.ws.rs.Path;
import jakarta.ws.rs.Produces;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.Response;

@Path(”/payments”)
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class PaymentResource {

    @Inject
    VersionContext versionContext;
    @Inject
    AdapterRegistry registry;
    @Inject
    PaymentService service;
    @Inject
    ObjectMapper mapper;

    @POST
    public Response createPayment(@Valid JsonNode body) throws Exception {
        String version = versionContext.get();

        // Pick the best request adapter for this version.
        // We support V1 and V2 request shapes across all versions.
        RequestAdapter<?> reqAdapter = pickRequestAdapter(version);

        // Deserialize into the adapter’s expected request type
        Object typedReq = mapper.treeToValue(body, reqAdapter.requestType());
        CanonicalPayment canonical = adaptToCanonical(reqAdapter, typedReq);

        // Business logic
        CanonicalPayment created = service.create(canonical);

        // Transform response for the same version
        Object versionedResponse = pickAndTransformResponse(version, created);

        return Response.ok(versionedResponse).build();
    }

    // ---- Helpers

    private RequestAdapter<?> pickRequestAdapter(String version) {
        // Try V2 first (has method), fallback to V1
        try {
            return registry.requestAdapterFor(version, PaymentV2.class);
        } catch (Exception ignore) {
            /* fallback */ }
        return registry.requestAdapterFor(version, PaymentV1.class);
    }

    @SuppressWarnings({ “unchecked”, “rawtypes” })
    private CanonicalPayment adaptToCanonical(RequestAdapter adapter, Object typedReq) {
        return adapter.toCanonical(typedReq);
    }

    private Object pickAndTransformResponse(String version, CanonicalPayment created) {
        // V3 returns richer response type; otherwise V2 or V1
        try {
            ResponseAdapter<PaymentV3Response> v3 = registry.responseAdapterFor(version, PaymentV3Response.class);
            return v3.fromCanonical(created);
        } catch (Exception ignore) {
        }

        try {
            ResponseAdapter<PaymentV2> v2 = registry.responseAdapterFor(version, PaymentV2.class);
            return v2.fromCanonical(created);
        } catch (Exception ignore) {
        }

        ResponseAdapter<PaymentV1> v1 = registry.responseAdapterFor(version, PaymentV1.class);
        return v1.fromCanonical(created);
    }
}

Why accept JsonNode? Because the resource signature stays stable while adapters own the request shape. This keeps your endpoint simple even as versions multiply.

Why versioned APIs often avoid `JsonNode` in the public signature

OpenAPI docs become unclear.
Consumers expect typed contracts.
Generic JSON breaks Swagger-UI examples (You’ll see this below)
Clients lose code-generation benefits.

Adapters are powerful, but be aware of the downsides if you operate them in front of DTOs.

Tests

We’ll verify all three versions with different payloads and response shapes. And yes, mark the day in the calendar, I have written tests for this tutorial :)

src/test/java/com/example/api/PaymentResourceTest.java

package com.example.api;

import static io.restassured.RestAssured.given;
import static org.hamcrest.Matchers.aMapWithSize;
import static org.hamcrest.Matchers.anyOf;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.isA;
import static org.hamcrest.Matchers.notNullValue;

import org.junit.jupiter.api.Test;

import io.quarkus.test.junit.QuarkusTest;

@QuarkusTest
public class PaymentResourceTest {

    @Test
    void v1_request_and_response() {
        given()
                .header(”X-API-Version”, “2023-10-16”)
                .contentType(”application/json”)
                .body(”{\”amount\”: 12.34}”)
                .when()
                .post(”/payments”)
                .then()
                .statusCode(200)
                // V1 response only has “amount”
                .body(”amount”, equalTo(12.34f))
                .body(”$”, aMapWithSize(1));
    }

    @Test
    void v2_request_and_response() {
        given()
                .header(”X-API-Version”, “2024-03-15”)
                .contentType(”application/json”)
                .body(”{\”amount\”: 99.99, \”method\”: \”CARD\”}”)
                .when()
                .post(”/payments”)
                .then()
                .statusCode(200)
                .body(”amount”, equalTo(99.99f))
                .body(”method”, equalTo(”CARD”));
    }

    @Test
    void v3_request_v2_shape_but_richer_response() {
        given()
                .header(”X-API-Version”, “2024-09-01”)
                .contentType(”application/json”)
                .body(”{\”amount\”: 50.00, \”method\”: \”SEPA\”}”)
                .when()
                .post(”/payments”)
                .then()
                .statusCode(200)
                .body(”id”, notNullValue())
                .body(”status”, anyOf(equalTo(”AUTHORIZED”), equalTo(”PENDING”)))
                .body(”confirmationRequired”, isA(Boolean.class));
    }

    @Test
    void default_version_when_header_missing() {
        given()
                .contentType(”application/json”)
                .body(”{\”amount\”: 10.00, \”method\”: \”CARD\”}”)
                .when()
                .post(”/payments”)
                .then()
                .statusCode(200)
                // Defaults to application.properties -> 2024-09-01 (V3 response)
                .body(”id”, notNullValue())
                .body(”confirmationRequired”, isA(Boolean.class));
    }
}

Run and verify

Start dev mode:

./mvnw quarkus:dev

Try the three versions:

# V1: old clients (no method)
curl -s -X POST http://localhost:8080/payments \
  -H 'Content-Type: application/json' \
  -H 'X-API-Version: 2023-10-16' \
  -d '{"amount": 12.34}' | jq

{
  “amount”: 12.34
}

# V2: adds method
curl -s -X POST http://localhost:8080/payments \
  -H 'Content-Type: application/json' \
  -H 'X-API-Version: 2024-03-15' \
  -d '{"amount": 99.99, "method": "CARD"}' | jq

{
  “amount”: 99.99,
  “method”: “CARD”
}

# V3: richer response, async hints
curl -s -X POST http://localhost:8080/payments \
  -H 'Content-Type: application/json' \
  -H 'X-API-Version: 2024-09-01' \
  -d '{"amount": 50.00, "method": "SEPA"}' | jq

{
  “id”: “3511a1a5-edfc-42da-a8ec-870b0c9446e3”,
  “amount”: 50.0,
  “method”: “SEPA”,
  “status”: “AUTHORIZED”,
  “createdAt”: “2025-11-27T09:36:36.80728+01:00”,
  “confirmationRequired”: true
}

Run tests:

./mvnw test

OpenAPI and Swagger:

UI: http://localhost:8080/q/swagger-ui
Document: http://localhost:8080/q/openapi

If you do not like the untyped API, you can add example request documentation to the PaymentResource.

@POST
    public Response createPayment(
        @RequestBody(
            description = “Versioned payment request”,
            content = @Content(
                mediaType = “application/json”,
                examples = {
                    @ExampleObject(
                        name = “V1”,
                        value = “”“
                        {
                          “amount”: 10.00
                        }
                        “”“
                    ),
                    @ExampleObject(
                        name = “V2”,
                        value = “”“
                        {
                          “amount”: 10.00,
                          “method”: “CARD”
                        }
                        “”“
                    ),
                    @ExampleObject(
                        name = “V3”,
                        value = “”“
                        {
                          “amount”: 10.00,
                          “method”: “SEPA”
                        }
                        “”“
                    )
                }
            )
        )
        @Valid JsonNode body) throws Exception {
        // same content
       }
}

Production notes

Metrics: Count version usage with a filter and tag by version; use Micrometer/Prometheus if needed.
Logs: Include version in structured logs for debugging transformations.
Faster selection: If you have dozens of versions, precompute a NavigableMap<LocalDate, AdapterSet> at startup.
Validation: Keep version-specific validation in DTOs and business rules in services.
Deprecation: Send Deprecation and Sunset headers for old versions, and cut adapters only after the grace period and strong telemetry.

Common pitfalls

Leaking version concerns into core. If your domain model knows about version fields, you’ve lost the separation.
Single resource per version. Tempting, but it explodes maintenance. Keep one resource, push differences into adapters.
Inconsistent stack. Mixing quarkus-resteasy-* with quarkus-rest-* will cause duplicate provider errors (Quarkus).

Where to go next

Generate versioned OpenAPI examples using @Schema and sample payloads per header value.
Add account defaults: a simple table mapping API keys → default version.
Support per-request overrides: we already do with X-API-Version.
Introduce webhooks and async flows in V3+ to mirror real payments.

You now have a complete, runnable Quarkus app that demonstrates Stripe-style version pinning with adapters. Extend it with real storage, metrics, and deprecation headers when you roll this pattern into production.

Ship it.

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