:sparkles: adding return to not send to a closed channel

internal/providers/provider.go

···
 		response, err := provider.Charge(charge)
 		if err != nil {
 			close(ch)
+			return
 		}
 		ch <- response
 	}()

request.hurl

···
+POST http://localhost:8000/payments
+Content-Type: application/json
+{
+	"amount": 10000,
+	"currency": "BRL",
+	"description": "Pagamento do Pix",
+	"paymentType": "card",
+	"card": {
+	    "number": "0000 0000 0000 0000",
+	    "holderName": "Teste Teste",
+	    "cvv": "123",
+	    "expirationDate": "12/2345",
+	    "installments": 1
+	}
+}