我试图实现Paypal SDK到我的iOS应用程序，我面临两个问题首先是我不能有Paylater按钮，即使我尝试了不同的参数，第二个是不支付后的实施将不同于正常？我添加我的努力，以便你可以帮助我找出问题.

func configurePayPalCheckout() {
      Checkout.setCreateOrderCallback { createOrderAction in
        let amount = PurchaseUnit.Amount(currencyCode: .mxn, value: "1500.00")
        let purchaseUnit = PurchaseUnit(amount: amount)
        let order = OrderRequest(intent: .capture, purchaseUnits: [purchaseUnit])
        createOrderAction.create(order: order)
      }

      Checkout.setOnApproveCallback { approval in
          
        approval.actions.capture { (response, error) in
          print("Order successfully captured: \(response?.data)")
        }
      }
    }

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我被这个问题困扰了好几天，如果这是一个菜鸟问题，我很抱歉。