Error status PAYER_ACTION_REQUIRED on order capture

[FabZip77]

On this Capture 

{
  "intent": "CAPTURE",
  "purchase_units": [
    {
      "reference_id": "vjzpnCV6E8R2G98IT2XV",
      "description": "Cart Ref.: vjzpnCV6E8R2G98IT2XV",
      "items": [
        {
          "name": "Rivivi i luoghi del commissario Montalbano",
          "quantity": "1",
          "description": "3, Tour del commissario Montalbano",
          "sku": "990-1856",
          "category": "DIGITAL_GOODS",
          "unit_amount": {
            "currency_code": "EUR",
            "value": "285.00"
          }
        }
      ],
      "amount": {
        "currency_code": "EUR",
        "value": "285.00",
        "breakdown": {
          "item_total": {
            "currency_code": "EUR",
            "value": "285.00"
          }
        }
      }
    }
  ],
  "payment_source": {
    "paypal": {
      "experience_context": {
        "shipping_preference": "NO_SHIPPING",
        "landing_page": "NO_PREFERENCE",
        "user_action": "PAY_NOW",
        "payment_method_preference": "IMMEDIATE_PAYMENT_REQUIRED",
        "locale": "it-IT",
        "return_url": "https://www.sicilying.com/it/bookofferta/booking?step=5",
        "cancel_url": "https://www.sicilying.com/it/bookofferta/booking",
        "payment_method_selected": "PAYPAL"
      },
      "email_address": "xxx@xxx",
      "name": {
        "given_name": "Name",
        "surname": "Surname"
      },
      "phone": {
        "phone_type": "MOBILE",
        "phone_number": {
          "national_number": "11996...(censored)"
        }
      }
    }
  }
}

I got this error

{
  "id": "35M64482FS100214S",
  "status": "PAYER_ACTION_REQUIRED",
  "payment_source": {
    "paypal": {
      "email_address": "xxx@xxx",
      "name": {
        "given_name": "Name",
        "surname": "Surname"
      },
      "phone_type": "MOBILE",
      "phone_number": {
        "national_number": "119960...(censored)"
      }
    }
  },
  "payer": {
    "name": {
      "given_name": "Name",
      "surname": "Surname"
    },
    "email_address": "xxx@xxx",
    "phone": {
      "phone_type": "MOBILE",
      "phone_number": {
        "national_number": "11996...(censored)"
      }
    }
  },
  "links": [
    {
      "href": "https://api.paypal.com/v2/checkout/orders/35M64482FS100214S",
      "rel": "self",
      "method": "GET"
    },
    {
      "href": "https://www.paypal.com/checkoutnow?token=35M64482FS100214S",
      "rel": "payer-action",
      "method": "GET"
    }
  ]
}

I read other users who had this error because "shipping_preference": "NO_SHIPPING" was missing,
but in my case it is there. What could be the problem?

[Here-to-help]

Hi, It means that the buyer hasn't approved the order yet.  You can only capture the order once it's approved.