[Refund] Fix partial refunds within same day

Author: NoResponseMate

spec/Provider/PaymentReferenceNumberProviderSpec.php

@@ -27,8 +27,8 @@ function it_implements_payment_reference_number_provider_interface(): void
     function it_provides_reference_number_based_on_payment_id_and_creation_date(PaymentInterface $payment): void
     {
         $payment->getId()->willReturn(123);
-        $payment->getCreatedAt()->willReturn(new \DateTime('10-03-2012'));
+        $payment->getCreatedAt()->willReturn(new \DateTime('10-03-2012 15:23:45'));
 
-        $this->provide($payment)->shouldReturn('123-10-03-2012');
+        $this->provide($payment)->shouldReturn('123-10-03-2012-15-23-45');
     }
 }

src/Provider/PaymentReferenceNumberProvider.php

@@ -22,6 +22,6 @@ public function provide(PaymentInterface $payment): string
         /** @var \DateTime $creationDate */
         $creationDate = $payment->getCreatedAt();
 
-        return ((string) $payment->getId()) . '-' . $creationDate->format('d-m-Y');
+        return ((string) $payment->getId()) . '-' . $creationDate->format('d-m-Y-H-i-s');
     }
 }