anchor.diff:  
   :DAS: this should be called credentials not keys
   </br>   **:DS Done.**
  -POST /apps/{id}/creds
  +POST /apps/{id}/sandbox-creds
   > Content-Type: application/json; charset=utf-8
   > Authorization: MAC id="...", ts="...", nonce="...", mac="..."
   {
  
positive.code:             "sharedSecret": "933n5-4m1n23-m13nn3-l12TYL",
              "links": {
                  "self": {
                      "href": "https://na.platform.points.com/apps/{id}/credentials/{id}"
                  }
              }
          }
      ]
      "accessibleLoyaltyPrograms": [
          {
              "name": "US Airways",
              "loyaltyProgram": "https://na.platform/points.com/loyalty-programs/9834701"
          },
          {
              "name": "Global Rewards",
              "loyaltyId": "https://na.platform/points.com/loyalty-programs/5678"
          }
      ]
      "links": {
          "self": { 
              "href": "https://na.platform.points.com/apps/{id}"
          },
          "sandboxCredentials": {
              "href": "https://na.platform.points.com/apps/{id}/credentials"
          }
      }
  }
  
negative.code: }
  < 201
  < Content-Type: application/json;charset=utf-8
  < Location: https://na.platform.points.com//apps/{id}/sandbox-creds/458934-234980f-kj234h-kj324kh
  {
      "status": "active",
      "publicKey": "458934-234980f-kj234h-kj324kh",
      "sharedSecret": "098341njk309-1jl;jk"
      "links": {
          "self": {
              "href": "https://na.platform.points.com/accounts/{id}/apps/{id}/sandbox-creds/458934-234980f-kj234h-kj324kh"
          }
          "app": {
              "href": "https://na.platform.points.com/apps/49282939"
          }
      }
  }
  
  Retrieve details about an Sandbox Cred
  GET /apps/{id}/sandbox-creds/{id}
  > Authorization: MAC id="...", ts="...", nonce="...", mac="..."
  < 200
  < Content-Type: application/json; charset=utf-8
  {
      "status": "active",
      "publicKey": "098341njk309-1jl;jk",
      "sharedSecret": "https://na.platform.points.com/apps/{id}/sandbox-creds/458934-234980f-kj234h-kj324kh"
      "links": {
          "self": {
              "href": "https://na.platform.points.com/apps/{id}/sandbox-creds/458934-234980f-kj234h-kj324kh"
          }
          "app": {
              "href": "https://na.platform.points.com/apps/49282939"
          }
      }
  }
  
  POST /apps/{id}/live-creds
  > Content-Type: application/json; charset=utf-8
  > Authorization: MAC id="...", ts="...", nonce="...", mac="..."
  {
      "status": "active",
  }
  < 201
  < Content-Type: application/json;charset=utf-8
  < Location: https://na.platform.points.com/apps/{id}/live-creds/458934-234980f-kj234h-kj324kh
  {
      "status": "active",
      "publicKey": "458934-234980f-kj234h-kj324kh",
      "sharedSecret": "098341njk309-1jl;jk"
      "links": {
          "self": {
              "href": "https://na.platform.points.com/apps/{id}/live-creds/458934-234980f-kj234h-kj324kh"
          }
          "app": {
              "href": "https://na.platform.points.com/apps/49282939"
          }
      }
  }
  
  Retrieve details about an App Key
  GET /apps/{id}/live-creds/{id}
  > Authorization: MAC id="...", ts="...", nonce="...", mac="..."
  < 200
  < Content-Type: application/json; charset=utf-8
  {
      "status": "active",
      "publicKey": "098341njk309-1jl;jk",
      "sharedSecret": "https://na.platform.points.com/apps/{id}/live-creds/458934-234980f-kj234h-kj324kh"
      "links": {
          "self": {
              "href": "https://na.platform.points.com/apps/{id}/live-creds/458934-234980f-kj234h-kj324kh"
          }
          "app": {
              "href": "https://na.platform.points.com/apps/49282939"
          }
      }
  }
  
  
  Add LPs to Sandbox mode
  PUT /apps/{id}/lp-access/sandbox
  