button smart amount is not show

[thinktothings]

).createOrder request:

curl -v -X POST  https://api.sandbox.paypal.com/v2/checkout/orders -H "Content-Type: application/json"   -H "Authorization: Bearer aa" -d '{

  "intent": "CAPTURE",

  "purchase_units": [

    {

      "amount": {

        "currency_code": "USD",

        "value": "18.00"

      }

     ,"payee":{ 

                    "email_address":"aaa", 

                    "merchant_id":"GHSVFMCN6" 

                 } 

    }

  ]

}'

).createOrder response

{"id":"1KR02119BX343853C","links":