diff --git a/docs/delivery_methods/ios.md b/docs/delivery_methods/ios.md
index 6a8a28d1..81c86118 100644
--- a/docs/delivery_methods/ios.md
+++ b/docs/delivery_methods/ios.md
@@ -20,78 +20,51 @@ https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_
 
 ```ruby
 class CommentNotification
-  deliver_by :ios
-end
-```
-
-With custom configuration:
-
-```ruby
-class CommentNotification
-  deliver_by :ios, format: :ios_format, cert_path: :ios_cert_path, key_id: :ios_key_id, team_id: :ios_team_id, pool_size: 5
-
-  # Customize notification
-  # See https://github.com/ostinelli/apnotic#apnoticnotification
-  def ios_format(apn)
-    apn.alert = "Hello world"
-    apn.custom_payload = { url: root_url }
-  end
-
-  def ios_cert_path
-    Rails.root.join("config/certs/ios/apns.p8")
-  end
-
-  def ios_key_id
-    Rails.application.credentials.dig(:ios, :key_id)
-  end
-
-  def ios_team_id
-    Rails.application.credentials.dig(:ios, :team_id)
+  deliver_by :ios do |config|
+    config.device_tokens = ->(recipient) { recipient.notification_tokens.where(platform: :iOS).pluck(:token) }
+    config.format = ->(apn) {
+      apn.alert = "Hello world"
+      apn.custom_payload = {url: root_url(host: "example.org")}
+    }
+    config.bundle_identifier = Rails.application.credentials.dig(:ios, :bundle_id)
+    config.key_id = Rails.application.credentials.dig(:ios, :key_id)
+    config.team_id = Rails.application.credentials.dig(:ios, :team_id)
+    config.apns_key = Rails.application.credentials.dig(:ios, :apns_key)
   end
 end
 ```
 
 ## Options
 
-* `format: :ios_format` - *Optional*
+* `format`
 
   Customize the Apnotic notification object
 
   See https://github.com/ostinelli/apnotic#apnoticnotification
 
-* `bundle_identifier: Rails.application.credentials.dig(:ios, :bundle_identifier)` - *Optional*
+* `bundle_identifier`
 
   The APN bundle identifier
 
-* `cert_path: Rails.root.join("config/certs/ios/apns.p8")` - *Optional*
+* `apns_key`
 
-  The location of your APNs p8 certificate.
-  This can also accept a StringIO object `StringIO.new("p8 file content as string")`.
-  As well as a File object `File.open("path/to/p8.file")`.
+  The contents of your p8 apns key file.
 
-* `key_id: Rails.application.credentials.dig(:ios, :key_id)` - *Optional*
+* `key_id`
 
   Your APN Key ID
 
-  If nothing passed, we'll default to `Rails.application.credentials.dig(:ios, :key_id)`
-  If a String is passed, we'll use that as the key ID.
-  If a Symbol is passed, we'll call the matching method and you can return the Key ID.
-
-* `team_id: Rails.application.credentials.dig(:ios, :team_id)` - *Optional*
+* `team_id`
 
   Your APN Team ID
 
-  If nothing passed, we'll default to `Rails.application.credentials.dig(:ios, :team_id)`
-  If a String is passed, we'll use that as the team ID.
-  If a Symbol is passed, we'll call the matching method and you can return the team ID.
-
 * `pool_size: 5` - *Optional*
 
   The connection pool size for Apnotic
 
-* `development: false` - *Optional*
+* `development` - *Optional*
 
-  Set this to true to use the APNS sandbox environment for sending notifications. This is required when running the app to your device via Xcode. Running the app via TestFlight or the App Store should not use development.
+  Set this to `true` to use the APNS sandbox environment for sending notifications. This is required when running the app to your device via Xcode. Running the app via TestFlight or the App Store should not use development.
 
 ## Gathering Notification Tokens
 
@@ -100,8 +73,8 @@ A recipient can have multiple tokens (i.e. multiple iOS devices), so make sure t
 Here, the recipient `has_many :notification_tokens` with columns `platform` and `token`.
 
 ```ruby
-def ios_device_tokens(recipient)
-  recipient.notification_tokens.where(platform: "iOS").pluck(:token)
+deliver_by :ios do |config|
+  config.device_tokens = ->(recipient) { recipient.notification_tokens.where(platform: :iOS).pluck(:token) }
 end
 ```
 
@@ -111,14 +84,8 @@ Apple Push Notifications may fail delivery if the user has removed the app from
 
 ```ruby
 class CommentNotification
-  deliver_by :ios
-
-  # Remove invalid device tokens
-  #
-  # token - the device token from iOS or Android
-  # platform - "iOS" or "Android"
-  def cleanup_device_token(token:, platform:)
-    NotificationToken.where(token: token, platform: platform).destroy_all
+  deliver_by :ios do |config|
+    config.invalid_token = ->(token) { NotificationToken.where(token: token).destroy_all }
   end
 end
 ```