diff --git a/src/Http/Payload/CreateMandatePayload.php b/src/Http/Payload/CreateMandatePayload.php
index fda0ccbf..db799c11 100644
--- a/src/Http/Payload/CreateMandatePayload.php
+++ b/src/Http/Payload/CreateMandatePayload.php
@@ -50,7 +50,7 @@ public function data(): array
             'consumerAccount' => $this->consumerAccount,
             'consumerBic' => $this->consumerBic,
             'consumerEmail' => $this->consumerEmail,
-            'signatureDate' => $this->signatureDate?->format('Y-m-d'),
+            'signatureDate' => $this->signatureDate ? $this->signatureDate->format('Y-m-d') : null,
             'mandateReference' => $this->mandateReference,
             'paypalBillingAgreementId' => $this->paypalBillingAgreementId,
         ];
diff --git a/src/Http/Payload/CreatePaymentLinkPayload.php b/src/Http/Payload/CreatePaymentLinkPayload.php
index c131c341..a66c62cf 100644
--- a/src/Http/Payload/CreatePaymentLinkPayload.php
+++ b/src/Http/Payload/CreatePaymentLinkPayload.php
@@ -47,7 +47,7 @@ public function data(): array
             'webhookUrl' => $this->webhookUrl,
             'profileId' => $this->profileId,
             'reusable' => $this->reusable,
-            'expiresAt' => $this->expiresAt?->format('Y-m-d'),
+            'expiresAt' => $this->expiresAt ? $this->expiresAt->format('Y-m-d') : null,
         ];
     }
 }
diff --git a/src/Http/Payload/CreateSubscriptionPayload.php b/src/Http/Payload/CreateSubscriptionPayload.php
index 648ba89a..49769e41 100644
--- a/src/Http/Payload/CreateSubscriptionPayload.php
+++ b/src/Http/Payload/CreateSubscriptionPayload.php
@@ -66,7 +66,7 @@ public function data(): array
             'description' => $this->description,
             'status' => $this->status,
             'times' => $this->times,
-            'startDate' => $this->startDate?->format('Y-m-d'),
+            'startDate' => $this->startDate ? $this->startDate->format('Y-m-d') : null,
             'method' => $this->method,
             'applicationFee' => $this->applicationFee,
             'metadata' => $this->metadata,
diff --git a/src/Http/Payload/UpdateSubscriptionPayload.php b/src/Http/Payload/UpdateSubscriptionPayload.php
index 76cb09ad..669f6cec 100644
--- a/src/Http/Payload/UpdateSubscriptionPayload.php
+++ b/src/Http/Payload/UpdateSubscriptionPayload.php
@@ -48,7 +48,7 @@ public function data(): array
             'amount' => $this->amount,
             'description' => $this->description,
             'interval' => $this->interval,
-            'startDate' => $this->startDate?->format('Y-m-d'),
+            'startDate' => $this->startDate ? $this->startDate->format('Y-m-d') : null,
             'times' => $this->times,
             'metadata' => $this->metadata,
             'webhookUrl' => $this->webhookUrl,
diff --git a/src/Http/Query/GetAllMethodsQuery.php b/src/Http/Query/GetAllMethodsQuery.php
index 85040dd5..00ef7495 100644
--- a/src/Http/Query/GetAllMethodsQuery.php
+++ b/src/Http/Query/GetAllMethodsQuery.php
@@ -35,7 +35,7 @@ public function toArray(): array
                 $this->includePricing ? MethodQuery::INCLUDE_PRICING : null,
             ]),
             'locale' => $this->locale,
-            'amount' => $this->amount?->data(),
+            'amount' => $this->amount ? $this->amount->data() : null,
         ];
     }
 }
diff --git a/src/Http/Query/GetEnabledPaymentMethodsQuery.php b/src/Http/Query/GetEnabledPaymentMethodsQuery.php
index 90cc6f6d..b0f11d96 100644
--- a/src/Http/Query/GetEnabledPaymentMethodsQuery.php
+++ b/src/Http/Query/GetEnabledPaymentMethodsQuery.php
@@ -26,7 +26,7 @@ public function toArray(): array
         return [
             'sequenceType' => $this->sequenceType,
             'locale' => $this->locale,
-            'amount' => $this->amount?->data(),
+            'amount' => $this->amount ? $this->amount->data() : null,
             'resource' => $this->resource,
             'billingCountry' => $this->billingCountry,
             'includeWallets' => Arr::join($this->includeWallets ?? []),