diff --git a/lib/api_clients/opswat_client.rb b/lib/api_clients/opswat_client.rb
index e69de29..a611a68 100644
--- a/lib/api_clients/opswat_client.rb
+++ b/lib/api_clients/opswat_client.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require 'httparty'
+require 'yaml'
+
+# Main class for communication with the OpSwat MetaDefender API v4
+class OpswatClient
+  # Load the OPSWAT API key from the config file
+  API_KEYS = YAML.load_file(File.join(__dir__, '../../config/api_keys.yml'))
+  OPSWAT_API_KEY = API_KEYS['opswat']
+  BASE_URL = 'https://api.metadefender.com/v4'
+
+  def self.scan_file(file_path)
+    # TODO: Implement file upload and scanning
+    # OPSWAT MetaDefender API requires the file to be uploaded for scanning
+    # The response will include a data_id which we can use to retrieve the scan results
+    response = upload_file(file_path)
+    data_id = response['data_id'] # TODO: This is hypothetical; adjust based on actual response structure
+
+    # Retrieve the scan result using the data_id
+    get_scan_result(data_id)
+  end
+
+  # Uploads a file to OPSWAT and returns the response
+  # TODO: Make this not just a skeleton
+  def self.upload_file(file_path)
+    endpoint = "#{BASE_URL}/file"
+    headers = {
+      'apikey' => OPSWAT_API_KEY
+      # Add other necessary CSR headers here
+    }
+    options = {
+      headers:,
+      body: { file: File.new(file_path, 'rb') }
+    }
+    HTTParty.post(endpoint, options)
+  end
+
+  # Retrieves the scan result for a given data_id
+  def self.get_scan_result(data_id)
+    # TODO: make this more robust
+    endpoint = "#{BASE_URL}/file/#{data_id}"
+    headers = {
+      'apikey' => OPSWAT_API_KEY
+      # Add other necessary CSR headers here
+    }
+    HTTParty.get(endpoint, headers:)
+  end
+end
diff --git a/lib/api_clients/virus_total_client.rb b/lib/api_clients/virus_total_client.rb
index e69de29..f2c5d58 100644
--- a/lib/api_clients/virus_total_client.rb
+++ b/lib/api_clients/virus_total_client.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'httparty'
+require 'yaml'
+
+# Main class for handling communication with the Virus Total API v3
+class VirusTotalClient
+  API_KEY = YAML.load_file(File.join(__dir__, '../../config/api_keys.yml'))['virus_total']
+  BASE_URL = 'https://www.virustotal.com/api/v3/'
+
+  def self.scan_url(url)
+    response = HTTParty.post("#{BASE_URL}urls",
+                             headers: { 'x-apikey' => API_KEY },
+                             body: { url: })
+    # TODO: Implement proper response handling
+    { is_safe: response.ok? } # Placeholder: Implement based on actual API response
+  end
+end
diff --git a/lib/database_manager.rb b/lib/database_manager.rb
index e33e8df..e8fa8e2 100644
--- a/lib/database_manager.rb
+++ b/lib/database_manager.rb
@@ -4,9 +4,23 @@ require 'sequel'
 
 DB = Sequel.sqlite(File.join(__dir__, '../db/diswarden.sqlite3'))
 
-# Schema definition
-DB.create_table? :scanned_files do
-  primary_key :id
-  String :file_hash, unique: true, null: false
-  Boolean :is_safe, default: true
+# Main class for handling Database ORM
+class DatabaseManager
+  # TODO: Implement this properly to save hashes
+  def self.file_hash_exists?(hash)
+    DB[:scanned_files].where(file_hash: hash).count.positive?
+  end
+
+  def self.insert_file_hash(hash, is_safe)
+    DB[:scanned_files].insert(file_hash: hash, is_safe:)
+  end
+
+  def create_table
+    # Schema definition
+    DB.create_table? :scanned_files do
+      primary_key :id
+      String :file_hash, unique: true, null: false
+      Boolean :is_safe, default: true
+    end
+  end
 end
diff --git a/lib/message_processor.rb b/lib/message_processor.rb
index e69de29..6d71311 100644
--- a/lib/message_processor.rb
+++ b/lib/message_processor.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+# this class is what actually processes the message, and extracts the file/link/image from it
+class MessageProcessor
+  def self.process_message(event)
+    # Check if the message has attachments
+    return if event.message.attachments.empty?
+
+    # Process each attachment
+    event.message.attachments.each do |attachment|
+      # TODO: logic to download the file and scan it (WIP)
+      puts "Found attachment: #{attachment.filename}"
+      # For now, just print the URL
+      puts "Attachment URL: #{attachment.url}"
+    end
+    # TODO: Add logic for links and images (WIP)
+  end
+end
diff --git a/lib/virus_scanner.rb b/lib/virus_scanner.rb
index e69de29..236895e 100644
--- a/lib/virus_scanner.rb
+++ b/lib/virus_scanner.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require 'httparty'
+require_relative 'api_clients/virus_total_client'
+
+# Main class for sending files/links to the security vendors, and getting the response.
+class VirusScanner
+  def self.scan_file(url)
+    response = VirusTotalClient.scan_url(url)
+    # TODO: Implement proper return
+    response['is_safe']
+  end
+end