货币金额必须为非负数,可以选择正好包含由“.”分隔的2个小数位

当我使用 vue-paypal-check :

 <PayPal amount="amount"
         currency="USD"
         :client="credentials"
         env="sandbox"
        >
 </Paypal>  
...
computed: {
  amount() {

    var total_price = Number(this.product_physical_session_storage_from_before.total_price_local)

    var abs_total_price = Math.abs(total_price.toFixed(2))

    return abs_total_price  // there is Number `120.00`
  }
},

我收到以下错误:

{“name”:“VALIDATION\u ERROR”,“details”:[{“field”:“transactions[0]。amount.total”,“issue”:“Currency amount必须是非负数,可以选择正好包含由“.”分隔的2个小数位,可选的千位分隔符“,”,小数点前限制为7位“}],“message”:“无效请求-请参阅详细信息”,“information\u link”:” https://developer.paypal.com/webapps/developer/docs/api/#VALIDATION_ERROR “,”debug\u id“:”efa7b058ad30e“}