diff --git a/Makefile b/Makefile
index d137fbdc..dacd22f5 100644
--- a/Makefile
+++ b/Makefile
@@ -45,6 +45,11 @@ publish-oas:
 	$(MAKE) copy-examples
 	npm run publish-oas
 
+set-authorization: guard-APIM_ENV
+	@ AUTHORIZATION=authorization-$$APIM_ENV.yml \
+	envsubst '$${AUTHORIZATION}' \
+	< specification/api/components/parameters/authorization/authorization-template.yml > specification/api/components/parameters/authorization/authorization.yml
+
 set-target: guard-APIM_ENV
 	@ TARGET=target-$$APIM_ENV.yml \
 	envsubst '$${TARGET}' \
@@ -64,6 +69,7 @@ set-security: guard-APIM_ENV
 	< specification/api/components/security-schemes/security-schemes-template.yml > specification/api/components/security-schemes/security-schemes.yml
 
 construct-spec: guard-APIM_ENV
+	$(MAKE) set-authorization APIM_ENV=$$APIM_ENV
 	$(MAKE) set-target APIM_ENV=$$APIM_ENV
 	$(MAKE) set-access APIM_ENV=$$APIM_ENV
 	$(MAKE) set-security APIM_ENV=$$APIM_ENV
diff --git a/VERSION b/VERSION
index 0e6bc07b..ed1dc891 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.0-${yyyy}${mm}${dd}.${HH}${MM}${SS}+${hash}
+1.0.1-${yyyy}${mm}${dd}.${HH}${MM}${SS}+${hash}
diff --git a/sdk/Makefile b/sdk/Makefile
index 76092481..ba052471 100644
--- a/sdk/Makefile
+++ b/sdk/Makefile
@@ -3,7 +3,7 @@ VERSION ?= ""
 SHELL = /bin/bash
 
 build: version # Build the project artefact @Pipeline
-	VER=$$(cat .version) && cd .. && npm run build --buildver=$$VER && cd sdk
+	VER=$$(cat .version) && cd .. && make build-yml-oas-spec APIM_ENV=prod && npm run generate --buildver=$$VER && cd sdk
 	./swagger-static.sh
 
 clean: # Clean-up project resources (main) @Operations
diff --git a/sdk/_config.version.yml b/sdk/_config.version.yml
index 9e5d8273..3941841c 100644
--- a/sdk/_config.version.yml
+++ b/sdk/_config.version.yml
@@ -1 +1 @@
-version: 0.2.0-20251120.121539+0c18993
+version: 1.0.1-20251125.131623+3d60875
diff --git a/specification/api/components/parameters/authorization/authorization-int.yml b/specification/api/components/parameters/authorization/authorization-int.yml
new file mode 100644
index 00000000..c4e9225d
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization-int.yml
@@ -0,0 +1,9 @@
+name: Authorization
+in: header
+description: |-
+  An OAuth 2.0 bearer token. Required in integration and production environments.
+required: true
+schema:
+  type: string
+  pattern: ^Bearer [[:ascii:]]+$
+  example: Bearer g1112R_ccQ1Ebbb4gtHBP1aaaNM
diff --git a/specification/api/components/parameters/authorization/authorization-internal-dev-pr.yml b/specification/api/components/parameters/authorization/authorization-internal-dev-pr.yml
new file mode 100644
index 00000000..e62b2067
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization-internal-dev-pr.yml
@@ -0,0 +1,7 @@
+name: apikey
+in: header
+description: |-
+  API Key to authorize in dynamic environments only.
+required: false
+schema:
+  type: string
diff --git a/specification/api/components/parameters/authorization/authorization-internal-dev.yml b/specification/api/components/parameters/authorization/authorization-internal-dev.yml
new file mode 100644
index 00000000..de566bd1
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization-internal-dev.yml
@@ -0,0 +1,9 @@
+name: Authorization
+in: header
+description: |-
+  An OAuth 2.0 bearer token. Required in integration and production environments.
+required: false
+schema:
+  type: string
+  pattern: ^Bearer [[:ascii:]]+$
+  example: Bearer g1112R_ccQ1Ebbb4gtHBP1aaaNM
diff --git a/specification/api/components/parameters/authorization/authorization-prod.yml b/specification/api/components/parameters/authorization/authorization-prod.yml
new file mode 100644
index 00000000..c4e9225d
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization-prod.yml
@@ -0,0 +1,9 @@
+name: Authorization
+in: header
+description: |-
+  An OAuth 2.0 bearer token. Required in integration and production environments.
+required: true
+schema:
+  type: string
+  pattern: ^Bearer [[:ascii:]]+$
+  example: Bearer g1112R_ccQ1Ebbb4gtHBP1aaaNM
diff --git a/specification/api/components/parameters/authorization/authorization-ref.yml b/specification/api/components/parameters/authorization/authorization-ref.yml
new file mode 100644
index 00000000..c4e9225d
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization-ref.yml
@@ -0,0 +1,9 @@
+name: Authorization
+in: header
+description: |-
+  An OAuth 2.0 bearer token. Required in integration and production environments.
+required: true
+schema:
+  type: string
+  pattern: ^Bearer [[:ascii:]]+$
+  example: Bearer g1112R_ccQ1Ebbb4gtHBP1aaaNM
diff --git a/specification/api/components/parameters/authorization/authorization-sandbox.yml b/specification/api/components/parameters/authorization/authorization-sandbox.yml
new file mode 100644
index 00000000..de566bd1
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization-sandbox.yml
@@ -0,0 +1,9 @@
+name: Authorization
+in: header
+description: |-
+  An OAuth 2.0 bearer token. Required in integration and production environments.
+required: false
+schema:
+  type: string
+  pattern: ^Bearer [[:ascii:]]+$
+  example: Bearer g1112R_ccQ1Ebbb4gtHBP1aaaNM
diff --git a/specification/api/components/parameters/authorization/authorization-template.yml b/specification/api/components/parameters/authorization/authorization-template.yml
new file mode 100644
index 00000000..dcb94c5f
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization-template.yml
@@ -0,0 +1 @@
+$ref: $AUTHORIZATION
diff --git a/specification/api/components/parameters/authorization/authorization.yml b/specification/api/components/parameters/authorization/authorization.yml
new file mode 100644
index 00000000..1dd82fdc
--- /dev/null
+++ b/specification/api/components/parameters/authorization/authorization.yml
@@ -0,0 +1 @@
+$ref: authorization-prod.yml
diff --git a/specification/api/components/security-schemes/security-schemes.yml b/specification/api/components/security-schemes/security-schemes.yml
index 33c6527d..78a3ea0e 100644
--- a/specification/api/components/security-schemes/security-schemes.yml
+++ b/specification/api/components/security-schemes/security-schemes.yml
@@ -1 +1 @@
-$ref: security-schemes-internal-dev-pr.yml
+$ref: security-schemes-prod.yml
diff --git a/specification/api/components/security/security.yml b/specification/api/components/security/security.yml
index 53a35667..393524ce 100644
--- a/specification/api/components/security/security.yml
+++ b/specification/api/components/security/security.yml
@@ -1 +1 @@
-$ref: security-internal-dev-pr.yml
+$ref: security-prod.yml
diff --git a/specification/api/components/x-nhsd-apim/access.yml b/specification/api/components/x-nhsd-apim/access.yml
index b0ce6064..c69c222d 100644
--- a/specification/api/components/x-nhsd-apim/access.yml
+++ b/specification/api/components/x-nhsd-apim/access.yml
@@ -1 +1 @@
-$ref: access-internal-dev-pr.yml
+$ref: access-prod.yml
diff --git a/specification/api/components/x-nhsd-apim/target.yml b/specification/api/components/x-nhsd-apim/target.yml
index 37ed0721..a0f578ca 100644
--- a/specification/api/components/x-nhsd-apim/target.yml
+++ b/specification/api/components/x-nhsd-apim/target.yml
@@ -1 +1 @@
-$ref: target-internal-dev-pr.yml
+$ref: target-prod.yml
diff --git a/specification/api/notify-supplier-phase1.yml b/specification/api/notify-supplier-phase1.yml
index 589c18af..9588b820 100644
--- a/specification/api/notify-supplier-phase1.yml
+++ b/specification/api/notify-supplier-phase1.yml
@@ -9,6 +9,7 @@ security:
 paths:
   /letters:
     parameters:
+      - $ref: 'components/parameters/authorization/authorization.yml'
       - $ref: 'components/parameters/requestId.yml'
       - $ref: 'components/parameters/correlationId.yml'
     post:
@@ -17,6 +18,7 @@ paths:
       $ref: 'components/endpoints/listLetters.yml'
   '/letters/{id}':
     parameters:
+      - $ref: 'components/parameters/authorization/authorization.yml'
       - $ref: 'components/parameters/requestId.yml'
       - $ref: 'components/parameters/correlationId.yml'
       - $ref: 'components/parameters/resourceId.yml'
@@ -26,6 +28,7 @@ paths:
       $ref: 'components/endpoints/patchLetter.yml'
   '/letters/{id}/data':
     parameters:
+      - $ref: 'components/parameters/authorization/authorization.yml'
       - $ref: 'components/parameters/resourceId.yml'
       - $ref: 'components/parameters/requestId.yml'
       - $ref: 'components/parameters/correlationId.yml'
@@ -35,6 +38,7 @@ paths:
     #  $ref: 'components/endpoints/headDataId.yml'
   /mi:
     parameters:
+      - $ref: 'components/parameters/authorization/authorization.yml'
       - $ref: 'components/parameters/requestId.yml'
       - $ref: 'components/parameters/correlationId.yml'
     post: