diff --git a/.github/workflows/integration-tests.yml b/.github/workflows/integration-tests.yml
index 6bdb3af7..13154906 100644
--- a/.github/workflows/integration-tests.yml
+++ b/.github/workflows/integration-tests.yml
@@ -25,7 +25,7 @@ jobs:
       ATALA_GITHUB_ACTOR: ${{ secrets.ATALA_GITHUB_ACTOR }}
       ATALA_GITHUB_TOKEN: ${{ secrets.ATALA_GITHUB_TOKEN }}
       REPORTS_DIR: "didcomm-v2-mediator-test-suite/target/site/serenity"
-      DIDCOMM_V2_TESTSUITE_VERSION: "v0.1.0"
+      DIDCOMM_V2_TESTSUITE_VERSION: "3ed43f8f864ef0ea1cd89a9f81d3f379e8c0c217" # old "v0.1.0"
       MEDIATOR_DID: "did:peer:2.Ez6LSghwSE437wnDE1pt3X6hVDUQzSjsHzinpX3XFvMjRAm7y.Vz6Mkhh1e5CEYYq6JBUcTZ6Cp2ranCWRrv7Yax3Le4N59R6dd.SeyJ0IjoiZG0iLCJzIjoiaHR0cDovL2xvY2FsaG9zdDo4MDgwIiwiciI6W10sImEiOlsiZGlkY29tbS92MiJdfQ"
     steps:
       - name: Checkout mediator
@@ -35,7 +35,7 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: input-output-hk/didcomm-v2-mediator-test-suite
-          path: './didcomm-v2-mediator-test-suite'
+          path: "./didcomm-v2-mediator-test-suite"
           ref: ${{ env.DIDCOMM_V2_TESTSUITE_VERSION }}
 
       - name: Setup Java and Scala
@@ -62,7 +62,7 @@ jobs:
         uses: ndeloof/install-compose-action@v0.0.1
         with:
           version: v2.19.1 # defaults to 'latest'
-          legacy: true    # will also install in PATH as `docker-compose`
+          legacy: true # will also install in PATH as `docker-compose`
 
       - name: Build local version of Mediator Agent
         env:
diff --git a/mediator/src/main/scala/io/iohk/atala/mediator/app/MediatorAgent.scala b/mediator/src/main/scala/io/iohk/atala/mediator/app/MediatorAgent.scala
index 6da8785d..31ae6f06 100644
--- a/mediator/src/main/scala/io/iohk/atala/mediator/app/MediatorAgent.scala
+++ b/mediator/src/main/scala/io/iohk/atala/mediator/app/MediatorAgent.scala
@@ -24,6 +24,7 @@ import scala.util.Try
 import scala.io.Source
 import zio.http.Header.AccessControlAllowOrigin
 import zio.http.Header.AccessControlAllowMethods
+import zio.http.Header.HeaderType
 
 case class MediatorAgent(
     override val id: DID,
@@ -267,53 +268,62 @@ object MediatorAgent {
         } yield (ret)
       },
       Method.POST / trailing -> handler { (req: Request) =>
-        {
-          if (
-            req.headers
-              .get("content-type")
-              .exists { h => h == MediaTypes.SIGNED.typ || h == MediaTypes.ENCRYPTED.typ }
-          ) {
-            for {
-              agent <- ZIO.service[MediatorAgent]
-              data <- req.body.asString
-                .catchAll(ex => ZIO.fail(Response.badRequest("Unable to read the body of the request")))
-              ret <- agent
-                .receiveMessage(data)
-                .map {
-                  case None                          => Response.ok
-                  case Some(value: SignedMessage)    => Response.json(value.toJson)
-                  case Some(value: EncryptedMessage) => Response.json(value.toJson)
-                }
-                .catchAll {
-                  case MediatorDidError(error) =>
-                    ZIO.logError(s"Error MediatorDidError: $error") *>
-                      ZIO.succeed(Response.status(Status.BadRequest))
-                  case MediatorThrowable(error) =>
-                    ZIO.logError(s"Error MediatorThrowable: $error") *>
-                      ZIO.succeed(Response.status(Status.BadRequest))
-                  case StorageCollection(error) =>
-                    ZIO.logError(s"Error StorageCollection: $error") *>
-                      ZIO.succeed(Response.status(Status.BadRequest))
-                  case StorageThrowable(error) =>
-                    ZIO.logError(s"Error StorageThrowable: $error") *>
-                      ZIO.succeed(Response.status(Status.BadRequest))
-                  case DuplicateMessage(error) =>
-                    ZIO.logError(s"Error DuplicateKeyError: $error") *>
-                      ZIO.succeed(Response.status(Status.BadRequest))
-                  case MissingProtocolError(piuri) =>
-                    ZIO.logError(s"MissingProtocolError ('$piuri')") *>
-                      ZIO.succeed(Response.status(Status.BadRequest)) // TODO
-                }
-            } yield ret
-          } else
-            ZIO
-              .logError(s"Request Headers: ${req.headers.mkString(",")}")
-              .as(
-                Response
-                  .text(s"The content-type must be ${MediaTypes.SIGNED.typ} or ${MediaTypes.ENCRYPTED.typ}")
-                  .copy(status = Status.BadRequest)
-              )
-        }
+        if (
+          req.headers
+            .get("content-type")
+            .exists { h => h == MediaTypes.SIGNED.typ || h == MediaTypes.ENCRYPTED.typ }
+        ) {
+          for {
+            agent <- ZIO.service[MediatorAgent]
+            data <- req.body.asString
+              .catchAll(ex => ZIO.fail(Response.badRequest("Unable to read the body of the request")))
+            ret <- agent
+              .receiveMessage(data)
+              .map {
+                case None => Response(status = Status.Accepted)
+                case Some(value: SignedMessage) =>
+                  Response(
+                    status = Status.Accepted,
+                    headers = Headers(Header.ContentType(MediaType.apply("application", "didcomm-signed+json"))),
+                    body = Body.fromCharSequence(value.toJson)
+                  )
+                case Some(value: EncryptedMessage) =>
+                  Response(
+                    status = Status.Accepted,
+                    headers = Headers(Header.ContentType(MediaType.apply("application", "didcomm-encrypted+json"))),
+                    body = Body.fromCharSequence(value.toJson)
+                  )
+              }
+              .catchAll {
+                case MediatorDidError(error) =>
+                  ZIO.logError(s"Error MediatorDidError: $error") *>
+                    ZIO.succeed(Response.status(Status.BadRequest))
+                case MediatorThrowable(error) =>
+                  ZIO.logError(s"Error MediatorThrowable: $error") *>
+                    ZIO.succeed(Response.status(Status.BadRequest))
+                case StorageCollection(error) =>
+                  ZIO.logError(s"Error StorageCollection: $error") *>
+                    ZIO.succeed(Response.status(Status.BadRequest))
+                case StorageThrowable(error) =>
+                  ZIO.logError(s"Error StorageThrowable: $error") *>
+                    ZIO.succeed(Response.status(Status.BadRequest))
+                case DuplicateMessage(error) =>
+                  ZIO.logError(s"Error DuplicateKeyError: $error") *>
+                    ZIO.succeed(Response.status(Status.BadRequest))
+                case MissingProtocolError(piuri) =>
+                  ZIO.logError(s"MissingProtocolError ('$piuri')") *>
+                    ZIO.succeed(Response.status(Status.BadRequest)) // TODO
+              }
+          } yield ret
+        } else
+          ZIO
+            .logError(s"Request Headers: ${req.headers.mkString(",")}")
+            .as(
+              Response
+                .text(s"The content-type must be ${MediaTypes.SIGNED.typ} or ${MediaTypes.ENCRYPTED.typ}")
+                .copy(status = Status.BadRequest)
+            )
+
       },
       Method.GET / trailing -> handler { (req: Request) =>
         for {