diff --git a/.github/workflows/diff-check.yml b/.github/workflows/diff-check.yml
index 89c375a9..030d8954 100644
--- a/.github/workflows/diff-check.yml
+++ b/.github/workflows/diff-check.yml
@@ -5,10 +5,12 @@ on:
   push:
     branches:
       - master
+  pull_request:
+  merge_group:
 
 jobs:
   tests:
-    name: Diff check and push
+    name: Generate OpenAPI based code
     runs-on: ubuntu-latest
 
     steps:
@@ -55,7 +57,15 @@ jobs:
           diff=$(git --no-pager diff --name-only HEAD)
           echo "DIFF_IS_EMPTY=$([[ -z "$diff" ]] && echo 'true' || echo 'false')" >> $GITHUB_ENV
           echo "CURRENT_DATETIME=$(date +'%Y%m%d%H%M%S')" >> $GITHUB_ENV
-      - if: ${{ env.DIFF_IS_EMPTY != 'true' }}
+      ## Run if diff exists and pull request, and make CI status failure (but allow renovate bot)
+      - if: ${{ github.event_name == 'pull_request' && env.DIFF_IS_EMPTY != 'true' && github.actor != 'renovate[bot]' }}
+        run: |
+          echo "There are changes in the generated codes. Please run 'generate-code.py' and commit the changes." >&2
+          echo "The files with differences are as follows." >&2
+          echo "$(git --no-pager diff --name-only HEAD)" >&2
+          exit 1
+      ## Run if diff exists and event is not pull request, and make PR
+      - if: ${{ github.event_name != 'pull_request' && env.DIFF_IS_EMPTY != 'true' }}
         run: |
           BRANCH_NAME="update-diff-${{ env.CURRENT_DATETIME }}"
           
diff --git a/.github/workflows/php-checks.yml b/.github/workflows/php-checks.yml
index 83e5cd7b..1407007f 100644
--- a/.github/workflows/php-checks.yml
+++ b/.github/workflows/php-checks.yml
@@ -6,60 +6,6 @@ on:
   merge_group:
 
 jobs:
-  diff-check:
-    name: Diff check
-    runs-on: ubuntu-latest
-
-    steps:
-      # Setup
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Update submodules
-        run: git submodule update --remote --recursive
-      - uses: actions/setup-node@v4
-        id: setup_node_id
-        with:
-          node-version: 18
-      - uses: shivammathur/setup-php@v2
-        with:
-          php-version: 8.2
-
-      # Install openapi-generator-cli
-      - run: echo "OPENAPI_GENERATOR_VERSION=6.6.0" >> $GITHUB_ENV
-      - uses: actions/cache@v4
-        id: openapi-generator-cache
-        env:
-          cache-name: openapi-generator-cache
-        with:
-          path: ~/bin/openapitools
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ env.OPENAPI_GENERATOR_VERSION }}
-      - if: steps.openapi-generator-cache.outputs.cache-hit != 'true'
-        run: |
-          mkdir -p ~/bin/openapitools
-          curl https://raw.githubusercontent.com/OpenAPITools/openapi-generator/master/bin/utils/openapi-generator-cli.sh > ~/bin/openapitools/openapi-generator-cli
-          chmod u+x ~/bin/openapitools/openapi-generator-cli
-          export PATH=$PATH:~/bin/openapitools/
-          OPENAPI_GENERATOR_VERSION=${{ env.OPENAPI_GENERATOR_VERSION }} openapi-generator-cli version
-
-      - name: Generate codes
-        run: |
-          export PATH=$PATH:~/bin/openapitools/
-          bash tools/gen-oas-client.sh
-      - name: Update document
-        run: |
-          wget https://github.com/phpDocumentor/phpDocumentor/releases/download/v3.3.1/phpDocumentor.phar
-          php phpDocumentor.phar run -d src -t docs
-      - run: |
-          diff=$(git --no-pager diff --name-only HEAD)
-          echo "DIFF_IS_EMPTY=$([[ -z "$diff" ]] && echo 'true' || echo 'false')" >> $GITHUB_ENV
-          echo "CURRENT_DATETIME=$(date +'%Y%m%d%H%M%S')" >> $GITHUB_ENV
-      - if: ${{ env.DIFF_IS_EMPTY != 'true' && github.actor != 'renovate[bot]' }}
-        run: |
-          echo "There are changes from the auto-generated files by OAS. Please run diff-check.yml and merge the PR generated by it first."
-          echo "The files with differences are as follows."
-          echo "$(git --no-pager diff --name-only HEAD)"
-          exit 1
   tests:
     name: Run checks on PHP ${{ matrix.php }}
     runs-on: ubuntu-latest