{
"openapi": "3.0.2",
"info": {
"title": "Klaviyo API",
"version": "2026-07-15",
"description": "The Klaviyo REST API. Please visit https://developers.klaviyo.com for more details.",
"contact": {
"name": "Klaviyo Developer Experience Team",
"email": "developers@klaviyo.com",
"url": "https://developers.klaviyo.com"
},
"termsOfService": "https://www.klaviyo.com/legal/api-terms",
"license": {
"name": "License",
"url": "https://www.klaviyo.com/legal"
}
},
"servers": [
{
"url": "https://a.klaviyo.com",
"description": "Production"
}
],
"security": [
{
"Klaviyo-API-Key": []
}
],
"paths": {
"/api/campaign-messages/{id}": {
"patch": {
"operationId": "update_campaign_message",
"summary": "Update Campaign Message",
"description": "Update a campaign message
*Rate limits*:
Burst: `10/s`
Steady: `150/m`\n\n**Scopes:**\n`campaigns:write`\n\n[OpenAPI Spec](https://raw.githubusercontent.com/klaviyo/openapi/main/openapi/stable/apis/update_campaign_message.json)",
"parameters": [
{
"name": "id",
"in": "path",
"description": "The message ID to be retrieved",
"required": true,
"schema": {
"description": "The message ID to be retrieved",
"type": "string"
}
},
{
"name": "fields[campaign-message]",
"in": "query",
"description": "For more information please visit https://developers.klaviyo.com/en/v2026-07-15/reference/api-overview#sparse-fieldsets",
"required": false,
"schema": {
"type": "array",
"items": {
"type": "string",
"enum": [
"created_at",
"definition",
"definition.channel",
"definition.content",
"definition.content.action_buttons",
"definition.content.bcc_email",
"definition.content.body",
"definition.content.cc_email",
"definition.content.dynamic_image",
"definition.content.from_email",
"definition.content.from_label",
"definition.content.media_url",
"definition.content.preview_text",
"definition.content.reply_to_email",
"definition.content.subject",
"definition.content.title",
"definition.kv_pairs",
"definition.label",
"definition.notification_type",
"definition.options",
"definition.options.badge",
"definition.options.badge.badge_options",
"definition.options.badge.badge_options.badge_config",
"definition.options.badge.badge_options.set_from_property",
"definition.options.badge.badge_options.value",
"definition.options.badge.display",
"definition.options.on_open",
"definition.options.on_open.android_deep_link",
"definition.options.on_open.ios_deep_link",
"definition.options.on_open.type",
"definition.options.on_open.web_url",
"definition.options.play_sound",
"definition.render_options",
"definition.render_options.add_info_link",
"definition.render_options.add_opt_out_language",
"definition.render_options.add_org_prefix",
"definition.render_options.shorten_links",
"id",
"send_times",
"updated_at"
]
}
},
"explode": false
},
{
"name": "revision",
"in": "header",
"description": "API endpoint revision (format: YYYY-MM-DD[.suffix])",
"required": true,
"schema": {
"type": "string",
"default": "2026-07-15"
}
}
],
"requestBody": {
"description": "Update a message and return it",
"required": true,
"content": {
"application/vnd.api+json": {
"schema": {
"$ref": "#/components/schemas/CampaignMessagePartialUpdateQuery"
}
}
}
},
"responses": {
"200": {
"description": "Success",
"content": {
"application/vnd.api+json": {
"schema": {
"$ref": "#/components/schemas/PatchCampaignMessageResponse"
}
}
}
},
"4XX": {
"$ref": "#/components/responses/ClientError"
},
"5XX": {
"$ref": "#/components/responses/ServerError"
}
},
"tags": [
"Campaigns"
],
"x-klaviyo-pre-release": "None",
"x-klaviyo-ratelimit": {
"burst": "10/s",
"steady": "150/m"
},
"x-klaviyo-scopes": [
"campaigns:write"
],
"x-klaviyo-subtag": "Messages"
}
}
},
"components": {
"responses": {
"ClientError": {
"description": "Client Error",
"content": {
"application/vnd.api+json": {
"schema": {
"type": "object",
"properties": {
"errors": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"code",
"title",
"detail"
],
"properties": {
"id": {
"type": "string"
},
"code": {
"type": "string"
},
"title": {
"type": "string"
},
"detail": {
"type": "string"
},
"source": {
"type": "object",
"properties": {
"pointer": {
"type": "string"
},
"parameter": {
"type": "string"
}
}
}
}
}
}
},
"required": [
"errors"
]
}
}
}
},
"ServerError": {
"description": "Server Error",
"content": {
"application/vnd.api+json": {
"schema": {
"type": "object",
"properties": {
"errors": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"code",
"title",
"detail"
],
"properties": {
"id": {
"type": "string"
},
"code": {
"type": "string"
},
"title": {
"type": "string"
},
"detail": {
"type": "string"
},
"source": {
"type": "object",
"properties": {
"pointer": {
"type": "string"
},
"parameter": {
"type": "string"
}
}
}
}
}
}
},
"required": [
"errors"
]
}
}
}
}
},
"schemas": {
"AgentHints": {
"description": "Optional hints emitted by the API for agent callers",
"type": "object",
"properties": {
"next_steps": {
"description": "Suggested follow-up actions for agents to take after this response",
"type": "array",
"items": {
"type": "string"
}
}
}
},
"CampaignEnum": {
"type": "string",
"enum": [
"campaign"
]
},
"CampaignMessageEnum": {
"type": "string",
"enum": [
"campaign-message"
]
},
"CampaignMessageIncrement": {
"type": "object",
"properties": {
"badge_config": {
"type": "string",
"enum": [
"increment_one"
]
}
},
"required": [
"badge_config"
]
},
"CampaignMessagePartialUpdateQuery": {
"type": "object",
"properties": {
"data": {
"$ref": "#/components/schemas/CampaignMessagePartialUpdateQueryResourceObject"
}
},
"required": [
"data"
]
},
"CampaignMessagePartialUpdateQueryResourceObject": {
"type": "object",
"properties": {
"type": {
"$ref": "#/components/schemas/CampaignMessageEnum"
},
"id": {
"description": "The message ID to be retrieved",
"type": "string"
},
"attributes": {
"type": "object",
"properties": {
"definition": {
"description": "The contents and settings of the campaign message",
"nullable": true,
"oneOf": [
{
"$ref": "#/components/schemas/EmailMessageDefinition"
},
{
"$ref": "#/components/schemas/SMSMessageDefinitionCreate"
},
{
"$ref": "#/components/schemas/MobilePushMessageStandardDefinitionUpdate"
},
{
"$ref": "#/components/schemas/MobilePushMessageSilentDefinitionUpdate"
}
]
}
}
},
"relationships": {
"type": "object",
"properties": {
"image": {
"type": "object",
"properties": {
"data": {
"type": "object",
"properties": {
"type": {
"$ref": "#/components/schemas/ImageEnum"
},
"id": {
"description": "The associated image for mobile_push or SMS messages",
"type": "string"
}
},
"required": [
"type",
"id"
]
}
}
}
}
}
},
"required": [
"type",
"id",
"attributes"
]
},
"CampaignMessageProperty": {
"type": "object",
"properties": {
"badge_config": {
"type": "string",
"enum": [
"set_property"
]
},
"set_from_property": {
"type": "string"
}
},
"required": [
"badge_config",
"set_from_property"
]
},
"CampaignMessageStaticCount": {
"type": "object",
"properties": {
"badge_config": {
"type": "string",
"enum": [
"set_count"
]
},
"value": {
"type": "string"
}
},
"required": [
"badge_config",
"value"
]
},
"EmailContent": {
"type": "object",
"properties": {
"subject": {
"description": "The subject of the message",
"type": "string",
"example": "Buy our product!",
"nullable": true
},
"preview_text": {
"description": "Preview text associated with the message",
"type": "string",
"example": "My preview text",
"nullable": true
},
"from_email": {
"description": "The email the message should be sent from",
"type": "string",
"example": "store@my-company.com",
"nullable": true
},
"from_label": {
"description": "The label associated with the from_email",
"type": "string",
"example": "My Company",
"nullable": true
},
"reply_to_email": {
"description": "Optional Reply-To email address",
"type": "string",
"example": "reply-to@my-company.com",
"nullable": true
},
"cc_email": {
"description": "Optional CC email address",
"type": "string",
"example": "cc@my-company.com",
"nullable": true
},
"bcc_email": {
"description": "Optional BCC email address",
"type": "string",
"example": "bcc@my-company.com",
"nullable": true
}
}
},
"EmailMessageDefinition": {
"type": "object",
"properties": {
"channel": {
"type": "string",
"enum": [
"email"
]
},
"label": {
"description": "The label or name on the message",
"type": "string",
"example": "My message name",
"nullable": true
},
"content": {
"$ref": "#/components/schemas/EmailContent",
"description": "Additional attributes relating to the content of the message",
"nullable": true
}
},
"required": [
"channel"
]
},
"ImageEnum": {
"type": "string",
"enum": [
"image"
]
},
"MobilePushBadge": {
"type": "object",
"properties": {
"display": {
"description": "Whether to display a badge on the app icon",
"type": "boolean",
"enum": [
true
]
},
"badge_options": {
"description": "Badge options",
"nullable": true,
"oneOf": [
{
"$ref": "#/components/schemas/CampaignMessageIncrement"
},
{
"$ref": "#/components/schemas/CampaignMessageStaticCount"
},
{
"$ref": "#/components/schemas/CampaignMessageProperty"
}
]
}
},
"required": [
"display"
]
},
"MobilePushContent": {
"type": "object",
"properties": {
"title": {
"description": "The title of the message",
"type": "string",
"nullable": true
},
"body": {
"description": "The message body",
"type": "string",
"example": "My preview push notification",
"nullable": true
},
"dynamic_image": {
"description": "The dynamic image to be used in the push notification",
"type": "string",
"nullable": true
},
"action_buttons": {
"description": "Action buttons for the push notification",
"type": "array",
"items": {
"$ref": "#/components/schemas/PushActionButtonDefinition"
},
"nullable": true
}
}
},
"MobilePushContentUpdate": {
"type": "object",
"properties": {
"title": {
"description": "The title of the message",
"type": "string",
"nullable": true
},
"body": {
"description": "The message body",
"type": "string",
"example": "My preview push notification",
"nullable": true
},
"dynamic_image": {
"description": "The dynamic image to be used in the push notification",
"type": "string",
"nullable": true
},
"action_buttons": {
"description": "Action buttons for the push notification (max 3, positions 0-indexed with no gaps)",
"type": "array",
"items": {
"$ref": "#/components/schemas/PushActionButtonDefinition"
},
"nullable": true
}
}
},
"MobilePushMessageSilentDefinition": {
"type": "object",
"properties": {
"channel": {
"type": "string",
"enum": [
"mobile_push"
]
},
"notification_type": {
"description": "The type of notification to send",
"type": "string",
"enum": [
"silent"
]
},
"kv_pairs": {
"description": "The key-value pairs to be sent with the push notification",
"type": "object",
"nullable": true
}
},
"required": [
"channel",
"notification_type"
]
},
"MobilePushMessageSilentDefinitionUpdate": {
"type": "object",
"properties": {
"channel": {
"type": "string",
"enum": [
"mobile_push"
]
},
"kv_pairs": {
"description": "The key-value pairs to be sent with the push notification",
"type": "object"
},
"notification_type": {
"description": "The type of notification to send",
"type": "string",
"example": "silent",
"default": "silent",
"enum": [
"silent"
]
}
},
"required": [
"channel"
]
},
"MobilePushMessageStandardDefinition": {
"type": "object",
"properties": {
"channel": {
"type": "string",
"enum": [
"mobile_push"
]
},
"notification_type": {
"description": "The type of notification to send",
"type": "string",
"enum": [
"standard"
]
},
"content": {
"$ref": "#/components/schemas/MobilePushContent",
"description": "Additional attributes relating to the content of the message"
},
"kv_pairs": {
"description": "The key-value pairs to be sent with the push notification",
"type": "object",
"nullable": true
},
"options": {
"$ref": "#/components/schemas/MobilePushOptions",
"nullable": true
}
},
"required": [
"channel",
"notification_type",
"content"
]
},
"MobilePushMessageStandardDefinitionUpdate": {
"type": "object",
"properties": {
"channel": {
"type": "string",
"enum": [
"mobile_push"
]
},
"kv_pairs": {
"description": "The key-value pairs to be sent with the push notification",
"type": "object",
"nullable": true
},
"content": {
"$ref": "#/components/schemas/MobilePushContentUpdate",
"description": "Additional attributes relating to the content of the message",
"nullable": true
},
"options": {
"description": "Additional device specific options for the push notification",
"$ref": "#/components/schemas/MobilePushOptions",
"nullable": true
},
"notification_type": {
"description": "The type of notification to send",
"type": "string",
"example": "standard",
"default": "standard",
"enum": [
"standard"
]
}
},
"required": [
"channel"
]
},
"MobilePushNoBadge": {
"type": "object",
"properties": {
"display": {
"description": "Whether to display a badge on the app icon",
"type": "boolean",
"enum": [
false
]
}
},
"required": [
"display"
]
},
"MobilePushOptions": {
"type": "object",
"properties": {
"on_open": {
"nullable": true,
"oneOf": [
{
"$ref": "#/components/schemas/PushOnOpenApp"
},
{
"$ref": "#/components/schemas/PushOnOpenDeepLink"
},
{
"$ref": "#/components/schemas/PushOnOpenWebUrl"
}
]
},
"badge": {
"description": "Only supported on iOS.",
"nullable": true,
"oneOf": [
{
"$ref": "#/components/schemas/MobilePushBadge"
},
{
"$ref": "#/components/schemas/MobilePushNoBadge"
}
]
},
"play_sound": {
"description": "Only supported on iOS.",
"type": "boolean",
"default": false,
"nullable": true
}
}
},
"ObjectLinks": {
"type": "object",
"properties": {
"self": {
"type": "string",
"format": "uri"
}
},
"required": [
"self"
]
},
"PatchCampaignMessageResponse": {
"type": "object",
"properties": {
"data": {
"type": "object",
"properties": {
"type": {
"$ref": "#/components/schemas/CampaignMessageEnum"
},
"id": {
"description": "The message ID",
"type": "string"
},
"attributes": {
"type": "object",
"properties": {
"definition": {
"nullable": true,
"oneOf": [
{
"$ref": "#/components/schemas/EmailMessageDefinition"
},
{
"$ref": "#/components/schemas/SMSMessageDefinition"
},
{
"$ref": "#/components/schemas/MobilePushMessageStandardDefinition"
},
{
"$ref": "#/components/schemas/MobilePushMessageSilentDefinition"
}
]
},
"send_times": {
"description": "The list of appropriate Send Time Sub-objects associated with the message",
"type": "array",
"items": {
"$ref": "#/components/schemas/SendTime"
},
"nullable": true
},
"created_at": {
"description": "The datetime when the message was created",
"type": "string",
"format": "date-time",
"example": "2022-11-08T00:00:00+00:00",
"nullable": true
},
"updated_at": {
"description": "The datetime when the message was last updated",
"type": "string",
"format": "date-time",
"example": "2022-11-08T00:00:00+00:00",
"nullable": true
}
}
},
"relationships": {
"type": "object",
"properties": {
"campaign": {
"type": "object",
"properties": {
"data": {
"type": "object",
"properties": {
"type": {
"$ref": "#/components/schemas/CampaignEnum"
},
"id": {
"description": "The parent campaign id",
"type": "string"
}
},
"required": [
"type",
"id"
]
},
"links": {
"$ref": "#/components/schemas/RelationshipLinks"
}
}
},
"template": {
"type": "object",
"properties": {
"data": {
"type": "object",
"properties": {
"type": {
"$ref": "#/components/schemas/TemplateEnum"
},
"id": {
"description": "The associated template id",
"type": "string"
}
},
"required": [
"type",
"id"
]
},
"links": {
"$ref": "#/components/schemas/RelationshipLinks"
}
}
},
"image": {
"type": "object",
"properties": {
"data": {
"type": "object",
"properties": {
"type": {
"$ref": "#/components/schemas/ImageEnum"
},
"id": {
"description": "The associated image id",
"type": "string"
}
},
"required": [
"type",
"id"
]
},
"links": {
"$ref": "#/components/schemas/RelationshipLinks"
}
}
}
}
},
"links": {
"$ref": "#/components/schemas/ObjectLinks"
}
},
"required": [
"type",
"id",
"attributes",
"links"
]
},
"links": {
"$ref": "#/components/schemas/ObjectLinks"
},
"meta": {
"$ref": "#/components/schemas/ResponseMeta"
}
},
"required": [
"data"
]
},
"PushActionButtonDefinition": {
"type": "object",
"properties": {
"label": {
"description": "The button label (max 40 characters)",
"type": "string"
},
"action_type": {
"description": "The action type: open_app, deep_link, open_url, or dismiss",
"type": "string"
},
"position": {
"description": "The display order of the button (0-indexed). If omitted, inferred from the button's order in the list.",
"type": "integer",
"nullable": true
},
"url": {
"description": "URL for deep_link or open_url action types (max 2048 characters). Used as a fallback on platforms without a more specific ios_deep_link or android_deep_link.",
"type": "string",
"nullable": true
},
"ios_deep_link": {
"description": "iOS-specific URL for deep_link or open_url action types (max 2048 characters). Overrides url on iOS.",
"type": "string",
"nullable": true
},
"android_deep_link": {
"description": "Android-specific URL for deep_link or open_url action types (max 2048 characters). Overrides url on Android.",
"type": "string",
"nullable": true
}
},
"required": [
"label",
"action_type"
]
},
"PushOnOpenApp": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"open_app"
]
}
},
"required": [
"type"
]
},
"PushOnOpenDeepLink": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"deep_link"
]
},
"ios_deep_link": {
"description": "required for all platforms enabled for push",
"type": "string",
"nullable": true
},
"android_deep_link": {
"description": "required for all platforms enabled for push",
"type": "string",
"nullable": true
}
},
"required": [
"type"
]
},
"PushOnOpenWebUrl": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"open_web_url"
]
},
"web_url": {
"description": "External url to open when push notification is triggered",
"type": "string",
"nullable": true
}
},
"required": [
"type"
]
},
"RelationshipLinks": {
"type": "object",
"properties": {
"self": {
"type": "string",
"format": "uri"
},
"related": {
"type": "string",
"format": "uri"
}
},
"required": [
"self",
"related"
]
},
"RenderOptions": {
"type": "object",
"properties": {
"shorten_links": {
"type": "boolean",
"example": true,
"default": true,
"nullable": true
},
"add_org_prefix": {
"type": "boolean",
"example": true,
"default": true,
"nullable": true
},
"add_info_link": {
"type": "boolean",
"example": true,
"default": true,
"nullable": true
},
"add_opt_out_language": {
"type": "boolean",
"default": false,
"nullable": true
}
}
},
"ResponseMeta": {
"description": "Response-level metadata",
"type": "object",
"properties": {
"agent_hints": {
"$ref": "#/components/schemas/AgentHints"
}
}
},
"SMSContent": {
"type": "object",
"properties": {
"body": {
"description": "The message body",
"type": "string",
"example": "My preview sms",
"nullable": true
},
"media_url": {
"description": "URL for included media",
"type": "string",
"nullable": true
}
}
},
"SMSContentCreate": {
"type": "object",
"properties": {
"body": {
"description": "The message body",
"type": "string",
"example": "My preview sms",
"nullable": true
}
}
},
"SMSMessageDefinition": {
"type": "object",
"properties": {
"channel": {
"type": "string",
"enum": [
"sms"
]
},
"content": {
"$ref": "#/components/schemas/SMSContent",
"description": "Additional attributes relating to the content of the message",
"nullable": true
},
"render_options": {
"description": "Additional options for rendering the message",
"$ref": "#/components/schemas/RenderOptions",
"nullable": true
}
},
"required": [
"channel"
]
},
"SMSMessageDefinitionCreate": {
"type": "object",
"properties": {
"channel": {
"type": "string",
"enum": [
"sms"
]
},
"content": {
"$ref": "#/components/schemas/SMSContentCreate",
"description": "Additional attributes relating to the content of the message",
"nullable": true
},
"render_options": {
"description": "Additional options for rendering the message",
"$ref": "#/components/schemas/RenderOptions",
"nullable": true
}
},
"required": [
"channel"
]
},
"SendTime": {
"type": "object",
"properties": {
"datetime": {
"description": "The datetime that the message is to be sent",
"type": "string",
"format": "date-time",
"example": "2022-11-08T00:00:00+00:00"
},
"is_local": {
"description": "Whether that datetime is to be a local datetime for the recipient",
"type": "boolean"
}
},
"required": [
"datetime",
"is_local"
]
},
"TemplateEnum": {
"type": "string",
"enum": [
"template"
]
}
},
"securitySchemes": {
"Klaviyo-API-Key": {
"type": "apiKey",
"in": "header",
"name": "Authorization",
"description": "Private key authentication for /api/ endpoints is performed by setting the `Authorization` header to `Klaviyo-API-Key your-private-api-key`
For more information please visit https://developers.klaviyo.com/en/v2026-07-15/reference/api-overview#authentication",
"x-default": "Klaviyo-API-Key your-private-api-key"
}
}
},
"tags": [
{
"name": "Campaigns",
"description": "campaigns"
}
]
}