Get a contact activity

curl --request GET \
  --url https://api.givebutter.com/v1/contacts/{contact}/activities/{activity} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "type": "<string>",
  "source": "<string>",
  "data": "<string>",
  "resource": {
    "id": "<string>",
    "plan_id": "<string>",
    "pledge_id": "<string>",
    "amount": 123,
    "fee": 123,
    "fee_covered": 123,
    "donated": 123,
    "payout": 123,
    "captured": "<string>",
    "captured_at": "<string>",
    "timezone": "<string>",
    "refunded": "<string>",
    "refunded_at": "<string>",
    "line_items": [
      {
        "type": "<string>",
        "subtype": "<string>",
        "description": "<string>",
        "quantity": 123,
        "price": 123,
        "discount": 123,
        "total": 123,
        "created_at": "<string>",
        "updated_at": "<string>"
      }
    ],
    "fair_market_value_amount": "<string>",
    "tax_deductible_amount": "<string>",
    "is_recurring": "<string>"
  },
  "resource_type": "transaction",
  "occurred_at": "<string>",
  "created_at": "<string>",
  "updated_at": "<string>",
  "created_by": {
    "id": "<string>",
    "first_name": "<string>",
    "last_name": "<string>",
    "email": "<string>"
  }
}