Get campaign flow

{  "data": {    "nodes": [      {        "id": "leadSource-1",        "type": "leadSource",        "position": {          "x": 0,          "y": 0        },        "data": {          "label": "Lead Bucket",          "customFieldKeys": [            "company"          ],          "mappedStandardFieldKeys": [            "email",            "first_name",            "last_name"          ],          "isRequired": true        },        "deletable": false      },      {        "id": "email-1",        "type": "email",        "position": {          "x": 220,          "y": 0        },        "data": {          "label": "Intro Email",          "priority": false,          "variants": [            {              "id": "11111111-1111-4111-8111-111111111111",              "label": "A",              "subject": "Quick question for {{first_name}}",              "template": "Hi {{first_name}} - reaching out about {{custom.company}}.",              "isActive": true,              "order": 0            },            {              "id": "11111111-1111-4111-8111-111111111112",              "label": "B",              "subject": "Following up for {{first_name}}",              "template": "Hi {{first_name}} - wanted to share a quick idea for {{custom.company}}.",              "isActive": true,              "order": 1            }          ]        }      },      {        "id": "waitTime-1",        "type": "waitTime",        "position": {          "x": 460,          "y": 0        },        "data": {          "label": "Wait 1 day",          "duration": "1",          "unit": "days",          "wait_duration_seconds": 86400        }      },      {        "id": "email-2",        "type": "email",        "position": {          "x": 700,          "y": 0        },        "data": {          "label": "Follow-up",          "priority": false,          "variants": [            {              "id": "22222222-2222-4222-8222-222222222221",              "label": "A",              "subject": "Bumping this for {{first_name}}",              "template": "Hi {{first_name}} - circling back in case this is relevant for {{custom.company}}.",              "isActive": true,              "order": 0            },            {              "id": "22222222-2222-4222-8222-222222222222",              "label": "B",              "subject": "Any thoughts, {{first_name}}?",              "template": "Hi {{first_name}} - should I close the loop or send more detail?",              "isActive": true,              "order": 1            }          ]        }      }    ],    "edges": [      {        "id": "e1",        "source": "leadSource-1",        "target": "email-1"      },      {        "id": "e2",        "source": "email-1",        "target": "waitTime-1"      },      {        "id": "e3",        "source": "waitTime-1",        "target": "email-2"      }    ]  }}

{  "error": {    "type": "authentication_error",    "code": "invalid_api_key",    "message": "A valid Furnace API key is required"  }}

{  "error": {    "type": "invalid_request_error",    "code": "campaign_not_found",    "message": "Campaign not found"  }}

{  "error": {    "type": "rate_limit_error",    "code": "rate_limit_exceeded",    "message": "Rate limit exceeded for this account"  }}

{  "error": {    "type": "api_error",    "code": "internal_error",    "message": "Internal server error"  }}