GET /companies/{companySlug}/activities/{activityId}

{
  "activityId": 12345,
  "name": "Development",
  "hourlyRate": 125000,
  "product": {
    "productId": 2888156,
    "createdDate": "2018-04-03",
    "lastModifiedDate": "2018-04-03",
    "name": "Spade",
    "unitPrice": 300000,
    "costPrice": 150000,
    "incomeAccount": "3000",
    "vatType": "HIGH",
    "active": true,
    "productNumber": "125-1",
    "stock": 5
  },
  "billable": true,
  "description": "Backend development work",
  "project": {
    "projectId": 73408306,
    "startDate": "2018-04-03",
    "endDate": "2018-04-03",
    "contact": {
      "contactId": 2747365,
      "createdDate": "2018-04-03",
      "lastModifiedDate": "2018-04-03",
      "name": "Fiken AS",
      "email": "kontakt@fiken.gmail",
      "organizationNumber": "913312465",
      "customerNumber": 51248,
      "customerAccountCode": "1500:20001",
      "phoneNumber": "62158537",
      "memberNumber": 5464,
      "memberNumberString": "5464",
      "supplierAccountCode": "2400:20001",
      "bankAccountNumber": "11112233334",
      "contactPerson": [
        {
          "contactPersonId": 2747365,
          "name": "Betty Boop",
          "email": "bb@gmail.com",
          "phoneNumber": "98573564",
          "address": {
            "streetAddress": "Karl Johan 34",
            "streetAddressLine2": "H0405",
            "city": "Oslo",
            "postCode": "0550",
            "country": "Norway"
          }
        }
      ],
      "notes": [
        {
          "author": "Betty Boop",
          "note": "Garage 45"
        }
      ],
      "currency": "NOK",
      "language": "Norwegian",
      "inactive": true,
      "daysUntilInvoicingDueDate": 15,
      "discount": 25,
      "address": {
        "streetAddress": "Karl Johan 34",
        "streetAddressLine2": "H0405",
        "city": "Oslo",
        "postCode": "0550",
        "country": "Norway"
      },
      "documents": [
        {
          "uuid": "745b2f15-1234-4408-8bf2-b1d2d7610cb2",
          "filename": "invoice_24760.pdf",
          "identifier": "24760",
          "type": "invoice"
        }
      ]
    }
  }
}