add webhook secret

app/controllers/webhook_secret_controller.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class WebhookSecretController < ApplicationController
+  before_action :load_encrypted_config
+  authorize_resource :encrypted_config, parent: false
+
+  def index; end
+
+  def create
+    @encrypted_config.assign_attributes(value: {
+      encrypted_config_params[:key] => encrypted_config_params[:value]
+    }.compact_blank)
+
+    @encrypted_config.value.present? ? @encrypted_config.save! : @encrypted_config.delete
+
+    redirect_back(fallback_location: settings_webhooks_path, notice: 'Webhook Secret has been saved.')
+  end
+
+  private
+
+  def load_encrypted_config
+    @encrypted_config =
+      current_account.encrypted_configs.find_or_initialize_by(key: EncryptedConfig::WEBHOOK_SECRET_KEY)
+  end
+
+  def encrypted_config_params
+    params.require(:encrypted_config).permit(value: %i[key value]).fetch(:value, {})
+  end
+end