diff --git a/.env b/.env
index ce2bdc4..07500aa 100644
--- a/.env
+++ b/.env
@@ -39,7 +39,7 @@ CRYPTO_SECRET=""
 ###< doctrineencryptbundle/doctrine-encrypt-bundle ###
 
 ###> App\Gateway\Stripe\StripeGateway ###
-STRIPE_API_KEY=""
+STRIPE_API_KEY="!ChangeMe!"
 STRIPE_WEBHOOK_SECRET=""
 ###< App\Gateway\Stripe\StripeGateway ###
 
diff --git a/README.md b/README.md
index 8fd6c7c..5efdf35 100644
--- a/README.md
+++ b/README.md
@@ -111,5 +111,5 @@ bin/docker mariadb mysql -u root -pgoteo goteo
 
 2. Grant *goteo* all privileges.
 ```mysql
-GRANT ALL PRIVILEGES ON *.* TO 'goteo'@'%'
+GRANT ALL PRIVILEGES ON *.* TO 'goteo'@'%';
 ```
diff --git a/src/ApiResource/Gateway/CheckoutApiResource.php b/src/ApiResource/Gateway/CheckoutApiResource.php
index 45c73b8..bbd0684 100644
--- a/src/ApiResource/Gateway/CheckoutApiResource.php
+++ b/src/ApiResource/Gateway/CheckoutApiResource.php
@@ -60,7 +60,7 @@ class CheckoutApiResource
      *
      * @var ChargeApiResource[]
      */
-    #[API\ApiProperty(readableLink: true)]
+    #[API\ApiProperty(readableLink: true, writableLink: true)]
     #[Assert\NotBlank()]
     #[Assert\Count(min: 1)]
     public array $charges = [];
diff --git a/src/Entity/EmbeddableMoney.php b/src/Entity/EmbeddableMoney.php
index 353981c..e75073f 100644
--- a/src/Entity/EmbeddableMoney.php
+++ b/src/Entity/EmbeddableMoney.php
@@ -20,16 +20,16 @@ class EmbeddableMoney implements MoneyInterface
      * Expressed as the minor unit, e.g: cents, pennies, etc.
      */
     #[ORM\Column(type: 'integer', nullable: true)]
-    private ?int $amount;
+    public ?int $amount;
 
     /**
      * 3-letter ISO 4217 currency code.
      */
     #[ORM\Column(type: 'string', nullable: true)]
-    private ?string $currency;
+    public ?string $currency;
 
     #[ORM\Column(type: 'json', nullable: true)]
-    private ?array $conversion;
+    public ?array $conversion;
 
     public function __construct(
         ?int $amount = null,