How to Create a PayPal Account Using Adaptive Accounts.curl

CreateAccount

HTTP Headers
------------
-H "X-PAYPAL-SECURITY-USERID: <Caller-UID>"             # UserID from the Caller account 
-H "X-PAYPAL-SECURITY-PASSWORD: <Caller-Pswd>"          # Password from the Caller account 
-H "X-PAYPAL-SECURITY-SIGNATURE: <Caller-Sig>"          # Signature from the Caller account
-H "X-PAYPAL-REQUEST-DATA-FORMAT: JSON" 
-H "X-PAYPAL-RESPONSE-DATA-FORMAT: JSON" 
-H "X-PAYPAL-SANDBOX-EMAIL-ADDRESS: <Caller-Sandbox-edress>"  
-H "X-PAYPAL-DEVICE-IPADDRESS: 192.0.2.0" 
-H "X-PAYPAL-APPLICATION-ID: APP-80W284485P519543T"    # Standard Sandbox App ID

Endpoint
--------
https://svcs.sandbox.paypal.com/AdaptiveAccounts/CreateAccount 

Input Parameters
----------------
-d "{
    "sandboxEmailAddress": "[email protected]",
    "accountType": "PERSONAL",
    "name": {
        "firstName": "Lenny",
        "lastName": "Riceman"
    },
    "address": {
        "line1": "123 Main St.",
        "city": "Austin",
        "state": "TX",
        "postalCode": "78759",
        "countryCode": "US"
    },
    "citizenshipCountryCode": "US",
    "contactPhoneNumber": "512-555-5555",
    "dateOfBirth": "1968-01-01Z",
    "currencyCode": "USD",
    "emailAddress": "[email protected]",
    "preferredLanguageCode": "en_US",
    "registrationType": "Web",
    "requestEnvelope": {
        "errorLanguage": "en_US"
    }
}" 

Response
--------
{
  "responseEnvelope": {
    "timestamp": "2014-09-23T12:35:07.442-07:00",
    "ack": "Success",
    "correlationId": "73e9513e3812c",
    "build": "12670835"
  },
  "createAccountKey": "AA-9GG80569J45735316",
  "execStatus": "COMPLETED",
  "redirectURL": "https://www.sandbox.paypal.com/us/cgi-bin/webscr?cmd=_hostedua-flow&encrypted_second_auth_code=<Code>&encrypted_id=<Id>",
  "accountId": "RCAHW8QAUHZAW"
}

Updated example as per comments from the Sandbox team.