diff --git a/src/Claims/Custom.php b/src/Claims/Custom.php
index 242765b0..0ad2a8ba 100644
--- a/src/Claims/Custom.php
+++ b/src/Claims/Custom.php
@@ -17,15 +17,14 @@
 class Custom extends Claim
 {
     /**
-     * @param string $name
-     *
-     * @return void
+     * Creates a custom claim
      *
      * @throws InvalidClaimException
      */
-    public function __construct($name, $value)
+    public function __construct(string $name, mixed $value)
     {
         parent::__construct($value);
+
         $this->setName($name);
     }
 }
diff --git a/src/Claims/Factory.php b/src/Claims/Factory.php
index 8476de5b..417935c4 100644
--- a/src/Claims/Factory.php
+++ b/src/Claims/Factory.php
@@ -20,32 +20,26 @@
 class Factory
 {
     /**
-     * The request.
-     *
-     * @var Request
+     * The Laravel request.
      */
-    protected $request;
+    protected Request $request;
 
     /**
-     * The TTL.
-     *
-     * @var int|null
+     * The time to live in minutes.
      */
-    protected $ttl = 60;
+    protected int $ttl = 60;
 
     /**
      * Time leeway in seconds.
-     *
-     * @var int
      */
-    protected $leeway = 0;
+    protected int $leeway = 0;
 
     /**
      * The classes map.
      *
      * @var array
      */
-    private $classMap = [
+    private array $classMap = [
         'aud' => Audience::class,
         'exp' => Expiration::class,
         'iat' => IssuedAt::class,
@@ -57,8 +51,6 @@ class Factory
 
     /**
      * Constructor.
-     *
-     * @return void
      */
     public function __construct(Request $request)
     {
@@ -68,13 +60,9 @@ public function __construct(Request $request)
     /**
      * Get the instance of the claim when passing the name and value.
      *
-     * @param string $name
-     *
-     * @return Claim
-     *
      * @throws InvalidClaimException
      */
-    public function get($name, $value)
+    public function get(string $name, mixed $value): Custom
     {
         if ($this->has($name)) {
             $claim = new $this->classMap[$name]($value);
@@ -89,12 +77,8 @@ public function get($name, $value)
 
     /**
      * Check whether the claim exists.
-     *
-     * @param string $name
-     *
-     * @return bool
      */
-    public function has($name)
+    public function has(string $name): bool
     {
         return array_key_exists($name, $this->classMap);
     }
@@ -102,76 +86,57 @@ public function has($name)
     /**
      * Generate the initial value and return the Claim instance.
      *
-     * @param string $name
-     *
-     * @return Claim
-     *
      * @throws InvalidClaimException
      */
-    public function make($name)
+    public function make(string $name): Claim
     {
         return $this->get($name, $this->$name());
     }
 
     /**
      * Get the Issuer (iss) claim.
-     *
-     * @return string
      */
-    public function iss()
+    public function iss(): string
     {
-        return $this->request->url();
+        return $this->request->url() ?? '';
     }
 
     /**
      * Get the Issued At (iat) claim.
-     *
-     * @return int
      */
-    public function iat()
+    public function iat(): int
     {
         return Utils::now()->getTimestamp();
     }
 
     /**
-     * Get the Expiration (exp) claim.
-     *
-     * @return int
+     * Get the Expiration (exp) claim as a unix timestamp
      */
-    public function exp()
+    public function exp(): int
     {
         return Utils::now()->addMinutes($this->ttl)->getTimestamp();
     }
 
     /**
-     * Get the Not Before (nbf) claim.
-     *
-     * @return int
+     * Get the Not Before (nbf) claim as a unix timestamp
      */
-    public function nbf()
+    public function nbf(): int
     {
         return Utils::now()->getTimestamp();
     }
 
     /**
      * Get the JWT Id (jti) claim.
-     *
-     * @return string
      */
-    public function jti()
+    public function jti(): string
     {
         return Str::random();
     }
 
     /**
      * Add a new claim mapping.
-     *
-     * @param string $name
-     * @param string $classPath
-     *
-     * @return $this
      */
-    public function extend($name, $classPath)
+    public function extend(string $name, string $classPath): self
     {
         $this->classMap[$name] = $classPath;
 
@@ -179,11 +144,9 @@ public function extend($name, $classPath)
     }
 
     /**
-     * Set the request instance.
-     *
-     * @return $this
+     * Set the Laravel request instance.
      */
-    public function setRequest(Request $request)
+    public function setRequest(Request $request): self
     {
         $this->request = $request;
 
@@ -192,36 +155,26 @@ public function setRequest(Request $request)
 
     /**
      * Set the token ttl (in minutes).
-     *
-     * @param int|null $ttl
-     *
-     * @return $this
      */
-    public function setTTL($ttl)
+    public function setTTL(int $ttl): self
     {
-        $this->ttl = $ttl ? (int) $ttl : $ttl;
+        $this->ttl = $ttl;
 
         return $this;
     }
 
     /**
      * Get the token ttl.
-     *
-     * @return int|null
      */
-    public function getTTL()
+    public function getTTL(): int
     {
         return $this->ttl;
     }
 
     /**
      * Set the leeway in seconds.
-     *
-     * @param int $leeway
-     *
-     * @return $this
      */
-    public function setLeeway($leeway)
+    public function setLeeway(int $leeway): self
     {
         $this->leeway = $leeway;
 
diff --git a/src/Claims/NotBefore.php b/src/Claims/NotBefore.php
index ee0878a2..4d981305 100644
--- a/src/Claims/NotBefore.php
+++ b/src/Claims/NotBefore.php
@@ -18,12 +18,12 @@ class NotBefore extends Claim
 {
     use DatetimeTrait;
 
-    protected $name = 'nbf';
+    protected string $name = 'nbf';
 
     /**
      * @throws TokenInvalidException
      */
-    public function validatePayload()
+    public function validatePayload(): void
     {
         if ($this->isFuture($this->getValue())) {
             throw new TokenInvalidException('Not Before (nbf) timestamp cannot be in the future');
diff --git a/src/Contracts/Claim.php b/src/Contracts/Claim.php
index d2aba815..8d68d9c9 100644
--- a/src/Contracts/Claim.php
+++ b/src/Contracts/Claim.php
@@ -18,38 +18,28 @@ interface Claim
 {
     /**
      * Set the claim value, and call a validate method.
-     *
-     * @return $this
-     *
+
      * @throws InvalidClaimException
      */
-    public function setValue($value);
+    public function setValue(mixed $value): self;
 
     /**
      * Get the claim value.
      */
-    public function getValue();
+    public function getValue(): mixed;
 
     /**
      * Set the claim name.
-     *
-     * @param string $name
-     *
-     * @return $this
      */
-    public function setName($name);
+    public function setName(string $name): self;
 
     /**
      * Get the claim name.
-     *
-     * @return string
      */
-    public function getName();
+    public function getName(): string;
 
     /**
-     * Validate the Claim value.
-     *
-     * @return bool
+     * Validate the Claim value, and return it
      */
-    public function validateCreate($value);
+    public function validateCreate(mixed $value): mixed;
 }
diff --git a/src/Contracts/Http/Parser.php b/src/Contracts/Http/Parser.php
index 01588e7d..4aea3d50 100644
--- a/src/Contracts/Http/Parser.php
+++ b/src/Contracts/Http/Parser.php
@@ -17,9 +17,7 @@
 interface Parser
 {
     /**
-     * Parse the request.
-     *
-     * @return string|null
+     * Parse the request, and return the desired value from it.
      */
-    public function parse(Request $request);
+    public function parse(Request $request): string|null;
 }
diff --git a/src/Providers/AbstractServiceProvider.php b/src/Providers/AbstractServiceProvider.php
index c1d730fa..2fab4887 100644
--- a/src/Providers/AbstractServiceProvider.php
+++ b/src/Providers/AbstractServiceProvider.php
@@ -300,14 +300,15 @@ protected function registerPayloadValidator()
      *
      * @return void
      */
-    protected function registerClaimFactory()
+    protected function registerClaimFactory(): void
     {
         $this->app->singleton('tymon.jwt.claim.factory', function ($app) {
             $factory = new ClaimFactory($app['request']);
             $app->refresh('request', $factory, 'setRequest');
+            $config = $app->make('config');
 
-            return $factory->setTTL($app->make('config')->get('jwt.ttl'))
-                           ->setLeeway($app->make('config')->get('jwt.leeway'));
+            return $factory->setTTL((int) $config->get('jwt.ttl'))
+                           ->setLeeway((int) $config->get('jwt.leeway'));
         });
     }
 
diff --git a/src/Support/CustomClaims.php b/src/Support/CustomClaims.php
index 5d3e6e88..34e70956 100644
--- a/src/Support/CustomClaims.php
+++ b/src/Support/CustomClaims.php
@@ -16,17 +16,13 @@ trait CustomClaims
 {
     /**
      * Custom claims.
-     *
-     * @var array
      */
-    protected $customClaims = [];
+    protected array $customClaims = [];
 
     /**
      * Set the custom claims.
-     *
-     * @return $this
      */
-    public function customClaims(array $customClaims)
+    public function setCustomClaims(array $customClaims): self
     {
         $this->customClaims = $customClaims;
 
@@ -34,22 +30,28 @@ public function customClaims(array $customClaims)
     }
 
     /**
-     * Alias to set the custom claims.
-     *
-     * @return $this
+     * Get the custom claims.
      */
-    public function claims(array $customClaims)
+    public function getCustomClaims(): array
     {
-        return $this->customClaims($customClaims);
+        return $this->customClaims;
     }
 
     /**
-     * Get the custom claims.
-     *
-     * @return array
+     * Alias of setCustomClaims.
+     * @deprecated Please use setCustomClaims(array)
      */
-    public function getCustomClaims()
+    public function customClaims(array $customClaims): self
     {
-        return $this->customClaims;
+        return $this->setCustomClaims($customClaims);
+    }
+
+    /**
+     * Alias of setCustomClaims.
+     * @deprecated Please use setCustomClaims(array)
+     */
+    public function claims(array $customClaims): self
+    {
+        return $this->setCustomClaims($customClaims);
     }
 }
diff --git a/src/Support/RefreshFlow.php b/src/Support/RefreshFlow.php
index c8db9e76..a07059b0 100644
--- a/src/Support/RefreshFlow.php
+++ b/src/Support/RefreshFlow.php
@@ -16,19 +16,13 @@ trait RefreshFlow
 {
     /**
      * The refresh flow flag.
-     *
-     * @var bool
      */
-    protected $refreshFlow = false;
+    protected bool $refreshFlow = false;
 
     /**
      * Set the refresh flow flag.
-     *
-     * @param bool $refreshFlow
-     *
-     * @return $this
      */
-    public function setRefreshFlow($refreshFlow = true)
+    public function setRefreshFlow(bool $refreshFlow = true): static
     {
         $this->refreshFlow = $refreshFlow;
 
diff --git a/src/Support/Utils.php b/src/Support/Utils.php
index 79daf282..aa855539 100644
--- a/src/Support/Utils.php
+++ b/src/Support/Utils.php
@@ -17,36 +17,25 @@
 class Utils
 {
     /**
-     * Get the Carbon instance for the current time.
-     *
-     * @return Carbon
+     * Get the Carbon instance for the current time, in the UTC timezone
      */
-    public static function now()
+    public static function now(): Carbon
     {
         return Carbon::now('UTC');
     }
 
     /**
-     * Get the Carbon instance for the timestamp.
-     *
-     * @param int $timestamp
-     *
-     * @return Carbon
+     * Get the Carbon instance for a unix timestamp, in UTC
      */
-    public static function timestamp($timestamp)
+    public static function timestamp(int $timestamp): Carbon
     {
         return Carbon::createFromTimestampUTC($timestamp)->timezone('UTC');
     }
 
     /**
-     * Checks if a timestamp is in the past.
-     *
-     * @param int $timestamp
-     * @param int $leeway
-     *
-     * @return bool
+     * Checks if a unix timestamp is in the past.
      */
-    public static function isPast($timestamp, $leeway = 0)
+    public static function isPast(int $timestamp, int $leeway = 0): bool
     {
         $timestamp = static::timestamp($timestamp);
 
@@ -56,14 +45,9 @@ public static function isPast($timestamp, $leeway = 0)
     }
 
     /**
-     * Checks if a timestamp is in the future.
-     *
-     * @param int $timestamp
-     * @param int $leeway
-     *
-     * @return bool
+     * Checks if a unix timestamp is in the future.
      */
-    public static function isFuture($timestamp, $leeway = 0)
+    public static function isFuture(int $timestamp, int $leeway = 0): bool
     {
         $timestamp = static::timestamp($timestamp);
 
diff --git a/src/Token.php b/src/Token.php
index 8084e2b6..f0e0466d 100644
--- a/src/Token.php
+++ b/src/Token.php
@@ -21,33 +21,25 @@ class Token
     /**
      * Create a new JSON Web Token.
      *
-     * @param string $value
-     *
-     * @return void
-     *
      * @throws Exceptions\TokenInvalidException
      */
-    public function __construct($value)
+    public function __construct(string $value)
     {
-        $this->value = (string) (new TokenValidator())->check($value);
+        $this->value = (new TokenValidator())->check($value);
     }
 
     /**
-     * Get the token.
-     *
-     * @return string
+     * Get the token as string.
      */
-    public function get()
+    public function get(): string
     {
         return $this->value;
     }
 
     /**
      * Get the token when casting to string.
-     *
-     * @return string
      */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->get();
     }