diff --git a/examples/asyncapi.yaml b/examples/asyncapi.yaml
new file mode 100644
index 00000000..9d442d08
--- /dev/null
+++ b/examples/asyncapi.yaml
@@ -0,0 +1,20 @@
+document:
+  dsl: 1.0.0-alpha1
+  namespace: examples
+  name: bearer-auth
+  version: 1.0.0-alpha1
+do:
+  greetUser:
+    call: asyncapi
+    with:
+      document:
+        uri: https://fake.com/docs/asyncapi.json
+      operationRef: findPetsByStatus
+      server: staging
+      message: getPetByStatusQuery
+      binding: http
+      payload:
+        petId: ${ .pet.id }
+      authentication:
+        bearer:
+          token: ${ .token }
diff --git a/examples/use-authentication.yaml b/examples/use-authentication.yaml
new file mode 100644
index 00000000..c8cd34fe
--- /dev/null
+++ b/examples/use-authentication.yaml
@@ -0,0 +1,18 @@
+document:
+  dsl: 1.0.0-alpha1
+  namespace: examples
+  name: bearer-auth
+  version: 1.0.0-alpha1
+use:
+  authentications:
+    petStoreAuth:
+      bearer:
+        token: ${ .token }
+do:
+  getPetById:
+    call: http
+    with:
+      method: get
+      endpoint:
+        uri: https://petstore.swagger.io/v2/pet/{petId}
+        authentication: petStoreAuth
diff --git a/schema/workflow.yaml b/schema/workflow.yaml
index f8d9c90d..eeef3dd7 100644
--- a/schema/workflow.yaml
+++ b/schema/workflow.yaml
@@ -133,7 +133,7 @@ $defs:
       - properties:
           call:
             type: string
-            constant: asyncapi
+            const: asyncapi
           with:
             type: object
             properties:
@@ -156,15 +156,17 @@ $defs:
                 type: object
                 description: The payload to call the AsyncAPI operation with, if any.
               authentication:
-                ref: '#/$defs/authenticationPolicy'
                 description: The authentication policy, if any, to use when calling the AsyncAPI operation.
+                oneOf:
+                  - $ref: '#/$defs/authenticationPolicy'
+                  - type: string
             required: [ document, operationRef ]
             description: Defines the AsyncAPI call to perform.
         required: [ call, with ]
       - properties:
           call:
             type: string
-            constant: grpc
+            const: grpc
           with:
             type: object
             properties:
@@ -187,8 +189,10 @@ $defs:
                     max: 65535
                     description: The port number of the GRPC service to call.
                   authentication:
-                    $ref: '#/$defs/authenticationPolicy'
                     description: The endpoint's authentication policy, if any.
+                    oneOf:
+                      - $ref: '#/$defs/authenticationPolicy'
+                      - type: string
                 required: [ name, host ]
               method:
                 type: string
@@ -203,7 +207,7 @@ $defs:
       - properties:
           call:
             type: string
-            constant: http
+            const: http
           with:
             type: object
             properties:
@@ -228,7 +232,7 @@ $defs:
       - properties:
           call:
             type: string
-            constant: openapi
+            const: openapi
           with:
             type: object
             properties:
@@ -243,8 +247,10 @@ $defs:
                 additionalProperties: true
                 description: A name/value mapping of the parameters of the OpenAPI operation to call.
               authentication:
-                $ref: '#/$defs/authenticationPolicy'
                 description: The authentication policy, if any, to use when calling the OpenAPI operation.
+                oneOf:
+                  - $ref: '#/$defs/authenticationPolicy'
+                  - type: string
               output:
                 type: string
                 enum: [ raw, content, response ]
@@ -264,6 +270,7 @@ $defs:
             description: A name/value mapping of the parameters, if any, to call the function with.
         required: [ call ]
   compositeTask:
+    type: object
     properties:
       execute:
         type: object
@@ -291,6 +298,7 @@ $defs:
     required: [ execute ]
     description: Serves as a pivotal orchestrator within workflow systems, enabling the seamless integration and execution of multiple subtasks to accomplish complex operations
   emitTask:
+    type: object
     properties:
       emit:
         type: object
@@ -332,6 +340,7 @@ $defs:
         default: continue
       - type: string
   forTask:
+    type: object
     properties:
       for:
         type: object
@@ -668,8 +677,10 @@ $defs:
         format: uri-template
         description: The endpoint's URI.
       authentication:
-        $ref: '#/$defs/authenticationPolicy'
         description: The authentication policy to use.
+        oneOf:
+          - $ref: '#/$defs/authenticationPolicy'
+          - type: string
     required: [ uri ]
   eventConsumptionStrategy:
     type: object
@@ -761,8 +772,10 @@ $defs:
         format: uri
         description: The endpoint's URI.
       authentication:
-        $ref: '#/$defs/authenticationPolicy'
         description: The authentication policy to use.
+        oneOf:
+          - $ref: '#/$defs/authenticationPolicy'
+          - type: string
       name:
         type: string
         description: The external resource's name, if any.