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+**PR URL Validation Solution**
+================================
+
+To validate the PR URL, we will use the GitHub API to check if the PR exists, belongs to the correct repository, and is authored by the submitting user.
+
+**Code Solution**
+-----------------
+
+```python
+import requests
+
+def validate_pr_url(pr_url, repo_owner, repo_name, submitting_user):
+    """
+    Validate the PR URL.
+
+    Args:
+    - pr_url (str): The PR URL to validate.
+    - repo_owner (str): The owner of the repository.
+    - repo_name (str): The name of the repository.
+    - submitting_user (str): The username of the submitting user.
+
+    Returns:
+    - bool: True if the PR URL is valid, False otherwise.
+    """
+    # Extract the PR number from the PR URL
+    pr_number = pr_url.split("/")[-1]
+
+    # Construct the GitHub API URL for the PR
+    api_url = f"https://api.github.com/repos/{repo_owner}/{repo_name}/pulls/{pr_number}"
+
+    # Send a GET request to the GitHub API
+    response = requests.get(api_url)
+
+    # Check if the response was successful
+    if response.status_code == 200:
+        # Get the PR data from the response
+        pr_data = response.json()
+
+        # Check if the PR belongs to the correct repository
+        if pr_data["base"]["repo"]["owner"]["login"] == repo_owner and pr_data["base"]["repo"]["name"] == repo_name:
+            # Check if the PR is authored by the submitting user
+            if pr_data["user"]["login"] == submitting_user:
+                return True
+
+    return False
+
+# Example usage
+repo_owner = "devasignhq"
+repo_name = "mobile-app"
+pr_url = "https://github.com/devasignhq/mobile-app/pull/119"
+submitting_user = "your-username"
+
+if validate_pr_url(pr_url, repo_owner, repo_name, submitting_user):
+    print("The PR URL is valid.")
+else:
+    print("The PR URL is not valid.")
+```
+
+**Explanation**
+---------------
+
+1. The `validate_pr_url` function takes four arguments: `pr_url`, `repo_owner`, `repo_name`, and `submitting_user`.
+2. It extracts the PR number from the PR URL using string splitting.
+3. It constructs the GitHub API URL for the PR using the `repo_owner`, `repo_name`, and `pr_number`.
+4. It sends a GET request to the GitHub API using the `requests` library.
+5. It checks if the response was successful (200 OK).
+6. If the response was successful, it gets the PR data from the response using the `json()` method.
+7. It checks if the PR belongs to the correct repository by comparing the `repo_owner` and `repo_name` with the values in the PR data.
+8. It checks if the PR is authored by the submitting user by comparing the `submitting_user` with the `user` value in the PR data.
+9. If all checks pass, it returns `True`, indicating that the PR URL is valid. Otherwise, it returns `False`.
+
+**Commit Message**
+------------------
+
+`Implement PR URL validation for submissions`
+
+**API Documentation**
+---------------------
+
+This solution uses the GitHub API to validate the PR URL. The API endpoint used is `GET /repos/{owner}/{repo}/pulls/{number}`, where `{owner}` is the repository owner, `{repo}` is the repository name, and `{number}` is the PR number. The API returns a JSON object containing the PR data, which is used to validate the PR URL.
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