+```
+
+Both values are available on the CashBox page in the fiskaltrust.Portal. On first use, you also need to **pair** the client via the PIN displayed in the Portal. For more information, see how to [Test the PosSystem API Helper](../../../../posdealers/technical-operations/middleware/helper-possystemapi.md#test-the-possystem-api-helper).
+
+##### Echo example
+
+**Request:**
+
+```json
+POST /api/v2/echo
+{
+ "message": "test"
+}
+```
+
+**Response:**
+
+```json
+{
+ "message": "test"
+}
+```
diff --git a/poscreators/middleware-doc/middleware-at-rksv/appendix-at-rksv.md b/poscreators/middleware-doc/middleware-at-rksv/appendix-at-rksv.md
index 716816f..5715160 100644
--- a/poscreators/middleware-doc/middleware-at-rksv/appendix-at-rksv.md
+++ b/poscreators/middleware-doc/middleware-at-rksv/appendix-at-rksv.md
@@ -17,4 +17,10 @@ https://www.lindeverlag.at/onlineprodukt/handbuch-registrierkassen-und-belegerte
Ritz/Koran/Kutschera/Knasmüller, Handbuch Registrierkassen- und Belegerteilungspflicht, 2. Auflage 2019, Linde Verlag Wien. ISBN: 9783707335910
+:::info Upgrading to PosSystem API (v2)
+
+New features such as e-invoicing are available exclusively through the **PosSystem API (v2)**. If you are currently using the v0 interface (WCF/REST), see the Migrating from API v0 to PosSystem API (v2) guide for instructions.
+
+:::
+
Please note that this information is only complete when combined with the General part. To implement the Middleware, users should get themselves familiar with the general information first and then refer to the country-specific details listed here.
diff --git a/poscreators/middleware-doc/middleware-de-kassensichv/appendix-de-kassensichv.md b/poscreators/middleware-doc/middleware-de-kassensichv/appendix-de-kassensichv.md
index 212dacd..da9e099 100644
--- a/poscreators/middleware-doc/middleware-de-kassensichv/appendix-de-kassensichv.md
+++ b/poscreators/middleware-doc/middleware-de-kassensichv/appendix-de-kassensichv.md
@@ -7,4 +7,10 @@ title: Introduction
This appendix expands on the General Part's information by adding details specific to the German market. This additional information is provided only where applicable. The remaining chapters, for which there is no further information required, were omitted.
+:::info Upgrading to PosSystem API (v2)
+
+New features such as e-invoicing are available exclusively through the **PosSystem API (v2)**. If you are currently using the v0 interface (WCF/REST), see the Migrating from API v0 to PosSystem API (v2) guide for instructions.
+
+:::
+
Please note that this information is only complete when combined with the General part. To implement the Middleware, users should get themselves familiar with the general information first and then refer to the country-specific details listed here.
diff --git a/poscreators/middleware-doc/middleware-fr-boi-tva-decla-30-10-30/appendix-fr-boi-tva-decla-30-10-30.md b/poscreators/middleware-doc/middleware-fr-boi-tva-decla-30-10-30/appendix-fr-boi-tva-decla-30-10-30.md
index bc27bd8..9236df1 100644
--- a/poscreators/middleware-doc/middleware-fr-boi-tva-decla-30-10-30/appendix-fr-boi-tva-decla-30-10-30.md
+++ b/poscreators/middleware-doc/middleware-fr-boi-tva-decla-30-10-30/appendix-fr-boi-tva-decla-30-10-30.md
@@ -23,4 +23,10 @@ The technical specification of the data interface described in this document pro
The interface specification is provided by fiskaltrust.Interface NuGet package, which can be found at https://www.nuget.org/packages/fiskaltrust.interface.
+:::info Upgrading to PosSystem API (v2)
+
+New features such as e-invoicing are available exclusively through the **PosSystem API (v2)**. If you are currently using the v0 interface (WCF/REST), see the Migrating from API v0 to PosSystem API (v2) guide for instructions.
+
+:::
+
Please note that this information is only complete when combined with the
General Part.
To implement the Middleware, users should get themselves familiar with the general information first and then refer to the country-specific details listed here.
diff --git a/poscreators/toc.js b/poscreators/toc.js
index 079bc64..fbc3e11 100644
--- a/poscreators/toc.js
+++ b/poscreators/toc.js
@@ -370,7 +370,7 @@ module.exports = [
},
],
},
- ],
+ ],
},
{
type: "category",
diff --git a/posdealers/technical-operations/middleware/helper-possystemapi.md b/posdealers/technical-operations/middleware/helper-possystemapi.md
index 9403573..1f9fb48 100644
--- a/posdealers/technical-operations/middleware/helper-possystemapi.md
+++ b/posdealers/technical-operations/middleware/helper-possystemapi.md
@@ -16,6 +16,12 @@ After reading this, you can set up and configure the local PosSystem API Helper
:::
+:::info Migrating from v0?
+
+If your POS system currently uses the v0 interface (WCF/REST) and you are migrating to the PosSystem API, see the [v0 → PosSystem API migration guide](../../../poscreators/middleware-doc/general/migration/v0-to-possystemapi.md) for a full overview of API and data model changes.
+
+:::
+
## Introduction
The local PosSystem API Helper is a Middleware component that exposes a local endpoint through which the POS System communicates with the fiskaltrust Middleware. It acts as a bridge between the POS System and the underlying Queue, and is required for Launcher 2.0 deployments.