Request

 curl -v https://api.sandbox.paypal.com/v1/payments/payment \                                                                                                                    
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer A21AAG_sHaCrvQURWObVETp38N6Hres90O6oo8lbrMQBe9YhlODYYni_gx1H8LCF_m97NcmoUmOJ2DB0c2E7HATqyDkDNMagQ' \
-d '{
"intent":"sale",    
"payer":{                         
      "payment_method":"paypal"                                                                                               
   },
   "transactions":[ 
      {     
         "amount":{            
            "currency":"BRL",
            "total":95,
            "details":{ 
              "shipping":11,
              "subtotal":75.00,
              "shipping_discount":1,
              "insurance":1,
              "handling_fee":1,
              "tax":6          
            }                       
         },                 
         "description":"This is the payment transaction description",
         "payment_options":{ 
            "allowed_payment_method":"IMMEDIATE_PAY"
         },
         "item_list":{                                               
            "shipping_address": {
                "recipient_name" : "PP Plus Recipient",
                "line1": "Gregório Rolim de Oliveira, 42",
                "line2": "JD Serrano II",
                "city": "Votorantim",                  
                "country_code": "BR",                     
                "postal_code": "18117-134",
                "state": "São Paulo",
                "phone": "0800-761-0880"
            },                             
            "items":[                
               { 
                  "name":"handbag",     
                  "description":"red diamond",
                  "quantity":"1",
                  "price":"75",    
                  "tax":"6",                  
                  "sku":"product34",
                  "currency":"BRL"
               }            
            ]                       
         }                        
      }         
   ],        
   "redirect_urls":{ 
      "return_url":"http://www.paypal.com",
      "cancel_url":"http://www.paypal.com"
   }                
}                                          
      
'

Response

*   Trying 173.0.82.78...
* TCP_NODELAY set
* Connected to api.sandbox.paypal.com (173.0.82.78) port 443 (#0)
* TLS 1.2 connection using TLS_RSA_WITH_AES_256_CBC_SHA256
* Server certificate: api.sandbox.paypal.com
* Server certificate: Symantec Class 3 Secure Server CA - G4
* Server certificate: VeriSign Class 3 Public Primary Certification Authority - G5
> POST /v1/payments/payment HTTP/1.1
> Host: api.sandbox.paypal.com
> User-Agent: curl/7.51.0
> Accept: */*
> Content-Type: application/json
> Authorization: Bearer A21AAG_sHaCrvQURWObVETp38N6Hres90O6oo8lbrMQBe9YhlODYYni_gx1H8LCF_m97NcmoUmOJ2DB0c2E7HATqyDkDNMagQ
> Content-Length: 1468
> Expect: 100-continue
> 
< HTTP/1.1 100 Continue
* We are completely uploaded and fine
< HTTP/1.1 400 Bad Request
< Date: Thu, 13 Apr 2017 10:43:42 GMT
< Server: Apache
< paypal-debug-id: 8e503a12a396e
< Content-Language: *
< Connection: close
< Paypal-Debug-Id: 8e503a12a396e
< Set-Cookie: X-PP-SILOVER=name%3DSANDBOX3.API.1%26silo_version%3D1880%26app%3Dplatformapiserv%26TIME%3D1582755672%26HTTP_X_PP_AZ_LOCATOR%3D; Expires=Thu, 13 Apr 2017 11:13:42 GMT; domain=.paypal.com; path=/; Secure; HttpOnly
< Set-Cookie: X-PP-SILOVER=; Expires=Thu, 01 Jan 1970 00:00:01 GMT
< Vary: Authorization
< Content-Length: 320
< Content-Type: application/json
< 
* Curl_http_done: called premature == 0
* Closing connection 0

{

"name":"VALIDATION_ERROR",
"details":[
{"field":"transactions[0].amount",
"issue":"Transaction amount details (subtotal, tax, shipping) must add up to specified amount total"}],
"message":"Invalid request - see details",
"information_link":"https://developer.paypal.com/docs/api/payments/#errors",
"debug_id":"8e503a12a396e"

}%