Klaviyo API

Klaviyo

Access the Klaviyo API with managed OAuth authentication. Manage profiles, lists, segments, campaigns, flows, events, metrics, templates, catalogs, and webhooks for email marketing and customer engagement.

Quick Start

# List profiles
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/profiles')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://gateway.maton.ai/klaviyo/{native-api-path}

Replace {native-api-path} with the actual Klaviyo API endpoint path. The gateway proxies requests to a.klaviyo.com and automatically injects your OAuth token.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as MATON_API_KEY:

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

1. Sign in or create an account at maton.ai
2. Go to maton.ai/settings
3. Copy your API key

API Versioning

Klaviyo uses date-based API versioning. Include the revision header in all requests:

revision: 2024-10-15

Connection Management

Manage your Klaviyo OAuth connections at https://ctrl.maton.ai.

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=klaviyo&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'klaviyo'}).encode()
req = urllib.request.Request('https://ctrl.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "21fd90f9-5935-43cd-b6c8-bde9d915ca80",
    "status": "ACTIVE",
    "creation_time": "2025-12-08T07:20:53.488460Z",
    "last_updated_time": "2026-01-31T20:03:32.593153Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "klaviyo",
    "metadata": {}
  }
}

Open the returned url in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple Klaviyo connections, specify which one to use with the Maton-Connection header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/profiles')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
req.add_header('Maton-Connection', '21fd90f9-5935-43cd-b6c8-bde9d915ca80')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If omitted, the gateway uses the default (oldest) active connection.

API Reference

Profiles

Manage customer data and consent.

Get Profiles

GET /klaviyo/api/profiles

Query parameters:

• filter - Filter profiles (e.g., filter=equals(email,"test@example.com"))
• fields[profile] - Comma-separated list of fields to include
• page[cursor] - Cursor for pagination
• page[size] - Number of results per page (max 100)
• sort - Sort field (prefix with - for descending)

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/profiles?fields[profile]=email,first_name,last_name&page[size]=10')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "data": [
    {
      "type": "profile",
      "id": "01GDDKASAP8TKDDA2GRZDSVP4H",
      "attributes": {
        "email": "alice@example.com",
        "first_name": "Alice",
        "last_name": "Johnson"
      }
    }
  ],
  "links": {
    "self": "https://a.klaviyo.com/api/profiles",
    "next": "https://a.klaviyo.com/api/profiles?page[cursor]=..."
  }
}

Get a Profile

GET /klaviyo/api/profiles/{profile_id}

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/profiles/01GDDKASAP8TKDDA2GRZDSVP4H')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create a Profile

POST /klaviyo/api/profiles
Content-Type: application/json

{
  "data": {
    "type": "profile",
    "attributes": {
      "email": "newuser@example.com",
      "first_name": "John",
      "last_name": "Doe",
      "phone_number": "+15551234567",
      "properties": {
        "custom_field": "value"
      }
    }
  }
}

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'profile', 'attributes': {'email': 'newuser@example.com', 'first_name': 'John', 'last_name': 'Doe'}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/profiles', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Update a Profile

PATCH /klaviyo/api/profiles/{profile_id}

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'profile', 'id': '01GDDKASAP8TKDDA2GRZDSVP4H', 'attributes': {'first_name': 'Jane'}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/profiles/01GDDKASAP8TKDDA2GRZDSVP4H', data=data, method='PATCH')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Merge Profiles

POST /klaviyo/api/profile-merge

Get Profile Lists

GET /klaviyo/api/profiles/{profile_id}/lists

Get Profile Segments

GET /klaviyo/api/profiles/{profile_id}/segments

Lists

Organize subscribers into static lists.

Get Lists

GET /klaviyo/api/lists

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/lists?fields[list]=name,created,updated')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "data": [
    {
      "type": "list",
      "id": "Y6nRLr",
      "attributes": {
        "name": "Newsletter Subscribers",
        "created": "2024-01-15T10:30:00Z",
        "updated": "2024-03-01T14:22:00Z"
      }
    }
  ]
}

Get a List

GET /klaviyo/api/lists/{list_id}

Create a List

POST /klaviyo/api/lists

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'list', 'attributes': {'name': 'VIP Customers'}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/lists', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Update a List

PATCH /klaviyo/api/lists/{list_id}

Delete a List

DELETE /klaviyo/api/lists/{list_id}

Add Profiles to List

POST /klaviyo/api/lists/{list_id}/relationships/profiles

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': [{'type': 'profile', 'id': '01GDDKASAP8TKDDA2GRZDSVP4H'}]}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/lists/Y6nRLr/relationships/profiles', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Remove Profiles from List

DELETE /klaviyo/api/lists/{list_id}/relationships/profiles

Get List Profiles

GET /klaviyo/api/lists/{list_id}/profiles

Segments

Create dynamic audiences based on conditions.

Get Segments

GET /klaviyo/api/segments

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/segments?fields[segment]=name,created,updated')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get a Segment

GET /klaviyo/api/segments/{segment_id}

Create a Segment

POST /klaviyo/api/segments

Update a Segment

PATCH /klaviyo/api/segments/{segment_id}

Delete a Segment

DELETE /klaviyo/api/segments/{segment_id}

Get Segment Profiles

GET /klaviyo/api/segments/{segment_id}/profiles

Campaigns

Design and send email campaigns.

Get Campaigns

GET /klaviyo/api/campaigns

Query parameters:

• filter - Filter campaigns (e.g., filter=equals(messages.channel,'email'))
• fields[campaign] - Fields to include
• sort - Sort by field

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/campaigns?filter=equals(messages.channel,"email")')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "data": [
    {
      "type": "campaign",
      "id": "01GDDKASAP8TKDDA2GRZDSVP4I",
      "attributes": {
        "name": "Spring Sale 2024",
        "status": "Draft",
        "audiences": {
          "included": ["Y6nRLr"],
          "excluded": []
        },
        "send_options": {
          "use_smart_sending": true
        }
      }
    }
  ]
}

Get a Campaign

GET /klaviyo/api/campaigns/{campaign_id}

Create a Campaign

POST /klaviyo/api/campaigns

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'campaign', 'attributes': {'name': 'Summer Newsletter', 'audiences': {'included': ['Y6nRLr']}, 'campaign-messages': {'data': [{'type': 'campaign-message', 'attributes': {'channel': 'email'}}]}}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/campaigns', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Update a Campaign

PATCH /klaviyo/api/campaigns/{campaign_id}

Delete a Campaign

DELETE /klaviyo/api/campaigns/{campaign_id}

Send a Campaign

POST /klaviyo/api/campaign-send-jobs

Get Recipient Estimation

POST /klaviyo/api/campaign-recipient-estimations

Flows

Build automated customer journeys.

Get Flows

GET /klaviyo/api/flows

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/flows?fields[flow]=name,status,created,updated')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "data": [
    {
      "type": "flow",
      "id": "VJvBNr",
      "attributes": {
        "name": "Welcome Series",
        "status": "live",
        "created": "2024-01-10T08:00:00Z",
        "updated": "2024-02-15T12:30:00Z"
      }
    }
  ]
}

Get a Flow

GET /klaviyo/api/flows/{flow_id}

Create a Flow

POST /klaviyo/api/flows

Note: Flow creation via API may be limited. Flows are typically created through the Klaviyo UI, then managed via API. Use GET, PATCH, and DELETE operations for existing flows.

Update Flow Status

PATCH /klaviyo/api/flows/{flow_id}

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'flow', 'id': 'VJvBNr', 'attributes': {'status': 'draft'}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/flows/VJvBNr', data=data, method='PATCH')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Delete a Flow

DELETE /klaviyo/api/flows/{flow_id}

Get Flow Actions

GET /klaviyo/api/flows/{flow_id}/flow-actions

Get Flow Messages

GET /klaviyo/api/flows/{flow_id}/flow-messages

Events

Track customer interactions and behaviors.

Get Events

GET /klaviyo/api/events

Query parameters:

• filter - Filter events (e.g., filter=equals(metric_id,"ABC123"))
• fields[event] - Fields to include
• sort - Sort by field (default: -datetime)

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/events?filter=greater-than(datetime,2024-01-01T00:00:00Z)&page[size]=50')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "data": [
    {
      "type": "event",
      "id": "4vRpBT",
      "attributes": {
        "metric_id": "TxVpCr",
        "profile_id": "01GDDKASAP8TKDDA2GRZDSVP4H",
        "datetime": "2024-03-15T14:30:00Z",
        "event_properties": {
          "value": 99.99,
          "product_name": "Running Shoes"
        }
      }
    }
  ]
}

Get an Event

GET /klaviyo/api/events/{event_id}

Create an Event

POST /klaviyo/api/events

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'event', 'attributes': {'profile': {'data': {'type': 'profile', 'attributes': {'email': 'customer@example.com'}}}, 'metric': {'data': {'type': 'metric', 'attributes': {'name': 'Viewed Product'}}}, 'properties': {'product_id': 'SKU123', 'product_name': 'Blue T-Shirt', 'price': 29.99}}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/events', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Bulk Create Events

POST /klaviyo/api/event-bulk-create-jobs

Metrics

Access performance data and analytics.

Get Metrics

GET /klaviyo/api/metrics

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/metrics')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "data": [
    {
      "type": "metric",
      "id": "TxVpCr",
      "attributes": {
        "name": "Placed Order",
        "created": "2024-01-01T00:00:00Z",
        "updated": "2024-03-01T00:00:00Z",
        "integration": {
          "object": "integration",
          "id": "shopify",
          "name": "Shopify"
        }
      }
    }
  ]
}

Get a Metric

GET /klaviyo/api/metrics/{metric_id}

Query Metric Aggregates

POST /klaviyo/api/metric-aggregates

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'metric-aggregate', 'attributes': {'metric_id': 'TxVpCr', 'measurements': ['count', 'sum_value'], 'interval': 'day', 'filter': ['greater-or-equal(datetime,2024-01-01)', 'less-than(datetime,2024-04-01)']}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/metric-aggregates', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Templates

Manage email templates.

Get Templates

GET /klaviyo/api/templates

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/templates?fields[template]=name,created,updated')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get a Template

GET /klaviyo/api/templates/{template_id}

Create a Template

POST /klaviyo/api/templates

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'template', 'attributes': {'name': 'Welcome Email', 'editor_type': 'CODE', 'html': '<html><body><h1>Welcome!</h1></body></html>'}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/templates', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Update a Template

PATCH /klaviyo/api/templates/{template_id}

Delete a Template

DELETE /klaviyo/api/templates/{template_id}

Render a Template

POST /klaviyo/api/template-render

Clone a Template

POST /klaviyo/api/template-clone

Catalogs

Manage product catalogs.

Get Catalog Items

GET /klaviyo/api/catalog-items

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/catalog-items?fields[catalog-item]=title,price,url')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "data": [
    {
      "type": "catalog-item",
      "id": "$custom:::$default:::PROD-001",
      "attributes": {
        "title": "Blue Running Shoes",
        "price": 129.99,
        "url": "https://store.example.com/products/blue-running-shoes"
      }
    }
  ]
}

Get a Catalog Item

GET /klaviyo/api/catalog-items/{catalog_item_id}

Create Catalog Items

POST /klaviyo/api/catalog-items

Update Catalog Item

PATCH /klaviyo/api/catalog-items/{catalog_item_id}

Delete Catalog Item

DELETE /klaviyo/api/catalog-items/{catalog_item_id}

Get Catalog Variants

GET /klaviyo/api/catalog-variants

Get Catalog Categories

GET /klaviyo/api/catalog-categories

Tags

Organize resources with tags.

Get Tags

GET /klaviyo/api/tags

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/tags')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create a Tag

POST /klaviyo/api/tags

Update a Tag

PATCH /klaviyo/api/tags/{tag_id}

Delete a Tag

DELETE /klaviyo/api/tags/{tag_id}

Tag a Campaign

POST /klaviyo/api/tag-campaign-relationships

Tag a Flow

POST /klaviyo/api/tag-flow-relationships

Coupons

Manage discount codes.

Get Coupons

GET /klaviyo/api/coupons

Create a Coupon

POST /klaviyo/api/coupons

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'coupon', 'attributes': {'external_id': 'SUMMER_SALE_2024', 'description': 'Summer sale discount coupon'}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/coupons', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Note: The external_id must match regex ^[0-9_A-z]+$ (alphanumeric and underscores only, no hyphens).

Get Coupon Codes

GET /klaviyo/api/coupon-codes

Note: This endpoint requires a filter parameter. You must filter by coupon ID or profile ID.

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/coupon-codes?filter=equals(coupon.id,"SUMMER_SALE_2024")')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Coupon Codes

POST /klaviyo/api/coupon-codes

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'coupon-code', 'attributes': {'unique_code': 'SAVE20NOW', 'expires_at': '2025-12-31T23:59:59Z'}, 'relationships': {'coupon': {'data': {'type': 'coupon', 'id': 'SUMMER_SALE_2024'}}}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/coupon-codes', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Webhooks

Configure event notifications.

Get Webhooks

GET /klaviyo/api/webhooks

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/webhooks')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Webhook

POST /klaviyo/api/webhooks

Example:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'data': {'type': 'webhook', 'attributes': {'name': 'Order Placed Webhook', 'endpoint_url': 'https://example.com/webhooks/klaviyo', 'enabled': True}, 'relationships': {'webhook-topics': {'data': [{'type': 'webhook-topic', 'id': 'campaign:sent'}]}}}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/webhooks', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get a Webhook

GET /klaviyo/api/webhooks/{webhook_id}

Update a Webhook

PATCH /klaviyo/api/webhooks/{webhook_id}

Delete a Webhook

DELETE /klaviyo/api/webhooks/{webhook_id}

Get Webhook Topics

GET /klaviyo/api/webhook-topics

Accounts

Retrieve account information.

Get Accounts

GET /klaviyo/api/accounts

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/accounts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Filtering

Klaviyo uses JSON:API filtering syntax. Common operators:

Combine filters with and:

filter=and(equals(status,"active"),greater-than(created,2024-01-01))

Pagination

Klaviyo uses cursor-based pagination:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/klaviyo/api/profiles?page[size]=50&page[cursor]=CURSOR_TOKEN')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('revision', '2024-10-15')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response includes pagination links:

{
  "data": [...],
  "links": {
    "self": "https://a.klaviyo.com/api/profiles",
    "next": "https://a.klaviyo.com/api/profiles?page[cursor]=WzE2..."
  }
}

Sparse Fieldsets

Request only specific fields to reduce response size:

# Request only email and first_name for profiles
?fields[profile]=email,first_name

# Request specific fields for included relationships
?include=lists&fields[list]=name,created

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/klaviyo/api/profiles?fields[profile]=email,first_name',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`,
      'revision': '2024-10-15'
    }
  }
);
const data = await response.json();

Python

import os
import requests

response = requests.get(
    'https://gateway.maton.ai/klaviyo/api/profiles',
    headers={
        'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}',
        'revision': '2024-10-15'
    },
    params={'fields[profile]': 'email,first_name'}
)
data = response.json()

Notes

• All requests use JSON:API specification
• Timestamps are in ISO 8601 RFC 3339 format (e.g., 2024-01-16T23:20:50.52Z)
• Resource IDs are strings (often base64-encoded)
• Use sparse fieldsets to optimize response size
• Include revision header for API versioning (recommended: 2024-10-15)
• Some POST endpoints return 200 instead of 201 for successful creation
• Coupon external_id must match regex ^[0-9_A-z]+$ (no hyphens)
• Coupon codes endpoint requires a filter (e.g., filter=equals(coupon.id,"..."))
• Flow creation via API may be limited; flows are typically created in the Klaviyo UI
• IMPORTANT: When using curl commands, use curl -g when URLs contain brackets (fields[], page[]) to disable glob parsing
• IMPORTANT: When piping curl output to jq or other commands, environment variables like $MATON_API_KEY may not expand correctly in some shell environments. You may get "Invalid API key" errors when piping.

Error Handling

Troubleshooting: Invalid API Key

When you receive a "Invalid API key" error, ALWAYS follow these steps before concluding there is an issue:

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

2. Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Resources

• Klaviyo API Documentation
• API Reference
• Klaviyo Developer Portal 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 9HW ;A 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