diff --git a/src/AcfComposer.php b/src/AcfComposer.php
index a3196224..43c42f7b 100644
--- a/src/AcfComposer.php
+++ b/src/AcfComposer.php
@@ -11,13 +11,6 @@
 
 class AcfComposer
 {
-    /**
-     * The application instance.
-     *
-     * @var \Roots\Acorn\Application
-     */
-    public $app;
-
     /**
      * The booted state.
      */
@@ -71,9 +64,8 @@ class AcfComposer
     /**
      * Create a new Composer instance.
      */
-    public function __construct(Application $app)
+    public function __construct(protected Application $app)
     {
-        $this->app = $app;
         $this->manifest = Manifest::make($this);
     }
 
diff --git a/src/Composer.php b/src/Composer.php
index c1ae495f..871835d6 100644
--- a/src/Composer.php
+++ b/src/Composer.php
@@ -6,12 +6,11 @@
 use Illuminate\Support\Str;
 use Log1x\AcfComposer\Concerns\InteractsWithPartial;
 use Log1x\AcfComposer\Contracts\Composer as ComposerContract;
-use Log1x\AcfComposer\Contracts\Field as FieldContract;
 use Log1x\AcfComposer\Exceptions\InvalidFieldsException;
 use Roots\Acorn\Application;
 use StoutLogic\AcfBuilder\FieldsBuilder;
 
-abstract class Composer implements ComposerContract, FieldContract
+abstract class Composer implements ComposerContract
 {
     use InteractsWithPartial;
 
@@ -68,29 +67,25 @@ public static function make(AcfComposer $composer): self
      */
     public function handle(): self
     {
-        $this->beforeRegister();
+        $this->call('beforeRegister');
 
         $this->compose();
 
-        $this->afterRegister();
+        $this->call('afterRegister');
 
         return $this;
     }
 
     /**
-     * Actions to run before registering the Composer.
+     * Call a method using the application container.
      */
-    public function beforeRegister(): void
+    protected function call(string $hook): mixed
     {
-        //
-    }
+        if (! method_exists($this, $hook)) {
+            return;
+        }
 
-    /**
-     * Actions to run after registering the Composer.
-     */
-    public function afterRegister(): void
-    {
-        //
+        return $this->app->call([$this, $hook]);
     }
 
     /**
@@ -98,7 +93,7 @@ public function afterRegister(): void
      */
     protected function register(?callable $callback = null): void
     {
-        if (empty($this->fields)) {
+        if (blank($this->fields)) {
             return;
         }
 
@@ -124,7 +119,9 @@ public function getFields(bool $cache = true): array
             return $this->composer->manifest()->get($this);
         }
 
-        $fields = is_a($fields = $this->fields(), FieldsBuilder::class)
+        $fields = $this->resolveFields();
+
+        $fields = is_a($fields, FieldsBuilder::class)
             ? $fields->build()
             : $fields;
 
@@ -139,6 +136,14 @@ public function getFields(bool $cache = true): array
         return $fields;
     }
 
+    /**
+     * Resolve the fields from the Composer with the container.
+     */
+    public function resolveFields(): mixed
+    {
+        return $this->call('fields') ?? [];
+    }
+
     /**
      * Build the field group with the default field type settings.
      */
@@ -147,7 +152,7 @@ public function build(array $fields = []): array
         return collect($fields)->map(function ($value, $key) {
             if (
                 ! in_array($key, $this->keys) ||
-                (Str::is($key, 'type') && ! $this->defaults->has($value))
+                ($key === 'type' && ! $this->defaults->has($value))
             ) {
                 return $value;
             }
@@ -158,7 +163,7 @@ public function build(array $fields = []): array
                         return $this->build($field);
                     }
 
-                    if (Str::is($key, 'type') && $this->defaults->has($value)) {
+                    if ($key === 'type' && $this->defaults->has($value)) {
                         $field = array_merge($this->defaults->get($field['type'], []), $field);
                     }
                 }
diff --git a/src/Contracts/Field.php b/src/Contracts/Field.php
deleted file mode 100644
index 7045ad34..00000000
--- a/src/Contracts/Field.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-namespace Log1x\AcfComposer\Contracts;
-
-interface Field
-{
-    /**
-     * The field group.
-     *
-     * @return \Log1x\AcfComposer\Builder|array
-     */
-    public function fields();
-}
diff --git a/src/Field.php b/src/Field.php
index fa794fb0..f2242c02 100644
--- a/src/Field.php
+++ b/src/Field.php
@@ -40,9 +40,9 @@ public function getFields(bool $cache = true): array
             return $this->composer->manifest()->get($this);
         }
 
-        $fields = $this->fields();
+        $fields = $this->resolveFields();
 
-        if (empty($fields)) {
+        if (blank($fields)) {
             return [];
         }
 
diff --git a/src/Partial.php b/src/Partial.php
index 99323251..8904b68a 100644
--- a/src/Partial.php
+++ b/src/Partial.php
@@ -7,13 +7,13 @@ abstract class Partial extends Composer
     /**
      * Compose and register the defined field groups with ACF.
      *
-     * @return mixed
+     * @return \StoutLogic\AcfBuilder\FieldsBuilder|void
      */
     public function compose()
     {
-        $fields = $this->fields();
+        $fields = $this->resolveFields();
 
-        if (empty($fields)) {
+        if (blank($fields)) {
             return;
         }