curl --request GET \
  --url https://{cluster}.voucherify.io/v1/loyalties/members/{memberId}/activity \
  --header 'Authorization: Bearer <token>' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>'

{
  "object": "list",
  "data_ref": "data",
  "data": [
    {
      "id": "evcus_0c150c51730c6b60b1",
      "type": "customer.loyalty.tier.upgraded",
      "data": {
        "data": {
          "customer": {
            "id": "<any>",
            "name": "<any>",
            "email": "<any>",
            "source_id": "<any>",
            "metadata": "<any>",
            "object": "<any>"
          },
          "campaign": {
            "id": "<string>",
            "name": "<string>",
            "campaign_type": "<string>",
            "type": "AUTO_UPDATE",
            "is_referral_code": true,
            "voucher": {
              "type": "<any>",
              "discount": "<any>",
              "gift": "<any>",
              "loyalty_card": "<any>",
              "redemption": "<any>",
              "code_config": "<any>"
            },
            "referral_program": {
              "conversion_event_type": "<any>",
              "custom_event": "<any>",
              "referee_reward": "<any>"
            },
            "auto_join": true,
            "join_once": true,
            "active": true,
            "category_id": "<string>",
            "category": "<string>",
            "categories": [
              "<any>"
            ],
            "metadata": {},
            "start_date": "2022-09-20T00:00:00.000Z",
            "expiration_date": "2022-09-30T00:00:00.000Z",
            "description": "<string>",
            "created_at": "2024-01-01T11:11:11.111Z",
            "updated_at": "2024-01-01T11:11:11.111Z",
            "object": "campaign"
          },
          "loyalty_tier_from": {
            "name": "<string>",
            "earning_rules": {},
            "rewards": {},
            "points": {
              "from": "<any>",
              "to": "<any>"
            },
            "id": "<string>",
            "campaign_id": "<string>",
            "metadata": {},
            "created_at": "2023-11-07T05:31:56Z",
            "updated_at": "2023-11-07T05:31:56Z",
            "config": {
              "points": "<any>"
            },
            "expiration": {
              "customer_id": "<any>",
              "campaign_id": "<any>",
              "tier_id": "<any>",
              "start_date": "<any>",
              "expiration_date": "<any>",
              "created_at": "<any>",
              "updated_at": "<any>"
            },
            "object": "loyalty_tier"
          },
          "loyalty_tier_to": {
            "name": "<string>",
            "earning_rules": {},
            "rewards": {},
            "points": {
              "from": "<any>",
              "to": "<any>"
            },
            "id": "<string>",
            "campaign_id": "<string>",
            "metadata": {},
            "created_at": "2023-11-07T05:31:56Z",
            "updated_at": "2023-11-07T05:31:56Z",
            "config": {
              "points": "<any>"
            },
            "expiration": {
              "customer_id": "<any>",
              "campaign_id": "<any>",
              "tier_id": "<any>",
              "start_date": "<any>",
              "expiration_date": "<any>",
              "created_at": "<any>",
              "updated_at": "<any>"
            },
            "object": "loyalty_tier"
          },
          "created_at": "2022-02-25T13:32:08.734Z"
        },
        "event_source": {
          "channel": "API",
          "user": {
            "id": "user_xyzfghSTprSTUVWXYlk6tuvXYst7FGH7"
          },
          "api_key": {
            "name": "<string>",
            "app_id": "1XXXX5XX-0XXX-XXXb-X7XX-XX2XXaXXX6XX"
          }
        }
      },
      "created_at": "2022-08-30T09:14:07.660Z",
      "group_id": "w-0e30613abc1f044513"
    }
  ],
  "has_more": true,
  "more_starting_after": "<string>"
}