title: PayPal Billing Agreement - No approval_url or redirect_url after creation
body: <p>I am trying to set up Billing Agreements using PayPal REST API with paypal-rest-api-sdk for Java on PayPal Sandbox. So, far I've been able to create a billing plan and pass it's id to create a Billing Agreement. However, the response that I get after creating a Billing Agreement does not have approval_url and redirect_url. The following is my request</p>
  
  <pre><code>{
   "name": "MYOP Recurring Contribution Agreement",
   "description": "Agreement for MYOP Recurring Contributions",
   "start_date": "2014-12-13T06:26:32Z",
   "payer": {
              "payment_method": "credit_card",
              "funding_instruments": [
                 {
                   "credit_card": {
                     "number": "XXXXXXXXXXXX",
                     "type": "visa",
                     "expire_month": 1,
                     "expire_year": 2015,
                     "cvv2": 874,
                     "first_name": "Joe",
                     "last_name": "Young",
                     "billing_address": {
                        "line1": "52 N Main ST",
                        "city": "Johnstown",
                        "country_code": "US",
                        "postal_code": "43210",
                        "state": "OH"
                      }
                   }
               }
            ]
        },
  "plan": {
      "id": "P-85A16162MC374104FU7KAYMQ"
   }
  }
  </code></pre>
  
  <p>As a response to my create Billing Agreement request, I receive only the following:</p>
  
  <pre><code>{
    "id": "I-77GK9WNNV04U",
    "links": [
        {
          "href": "https://api.sandbox.paypal.com/v1/payments/billing-agreements/I-77GK9WNNV04U",
          "rel": "self",
          "method": "GET"
        }
     ]
  }
  </code></pre>
  
  <p>When I fetch the created Billing Agreement with a GET request on the agreement id, I receive information about the agreement that has a 'links' array that does not contain approval_url or redirect_url.</p>
  
  <p>I am unable to proceed to send the payer to an approval url to then execute the agreement. Help please.</p>