{
  "openapi": "3.0.2",
  "info": {
    "title": "Klaviyo API",
    "version": "2026-04-15",
    "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}/relationships/template": {
      "get": {
        "operationId": "get_template_id_for_campaign_message",
        "summary": "Get Template ID for Campaign Message",
        "description": "Returns the ID of the related template<br><br>*Rate limits*:<br>Burst: `10/s`<br>Steady: `150/m`\n\n**Scopes:**\n`campaigns:read`\n`templates:read`\n\n[OpenAPI Spec](https://raw.githubusercontent.com/klaviyo/openapi/main/openapi/stable/apis/get_template_id_for_campaign_message.json)",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "description": "",
            "required": true,
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "revision",
            "in": "header",
            "description": "API endpoint revision (format: YYYY-MM-DD[.suffix])",
            "required": true,
            "schema": {
              "type": "string",
              "default": "2026-04-15"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Success",
            "content": {
              "application/vnd.api+json": {
                "schema": {
                  "$ref": "#/components/schemas/GetCampaignMessageTemplateRelationshipResponse"
                }
              }
            }
          },
          "4XX": {
            "$ref": "#/components/responses/ClientError"
          },
          "5XX": {
            "$ref": "#/components/responses/ServerError"
          }
        },
        "tags": [
          "Campaigns"
        ],
        "x-klaviyo-operation-aliases": [
          "get_campaign_message_relationships_template"
        ],
        "x-klaviyo-pre-release": "None",
        "x-klaviyo-ratelimit": {
          "burst": "10/s",
          "steady": "150/m"
        },
        "x-klaviyo-scopes": [
          "campaigns:read",
          "templates:read"
        ],
        "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": {
      "GetCampaignMessageTemplateRelationshipResponse": {
        "type": "object",
        "properties": {
          "data": {
            "type": "object",
            "nullable": true,
            "properties": {
              "type": {
                "$ref": "#/components/schemas/TemplateEnum"
              },
              "id": {
                "description": "The ID of template",
                "type": "string"
              }
            },
            "required": [
              "type",
              "id"
            ]
          },
          "links": {
            "$ref": "#/components/schemas/ObjectLinks"
          }
        },
        "required": [
          "data"
        ]
      },
      "ObjectLinks": {
        "type": "object",
        "properties": {
          "self": {
            "type": "string",
            "format": "uri"
          }
        },
        "required": [
          "self"
        ]
      },
      "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`<br>For more information please visit https://developers.klaviyo.com/en/v2026-04-15/reference/api-overview#authentication",
        "x-default": "Klaviyo-API-Key your-private-api-key"
      }
    }
  },
  "tags": [
    {
      "name": "Campaigns",
      "description": "campaigns"
    }
  ]
}