Update email template

API at a glance

Description: This API updates an existing email template in your Blueshift account. You can modify the template content, subject line, preheader, recommendation schemes, external fetches, and other properties.

Authentication & testing

Testing the API on this page

How to try it here

Use your User API Key as the Username (leave Password blank).

Select the appropriate API endpoint based on your Blueshift region.

Enter the necessary parameters and click Try It to run the request.

Authentication using Base64 encoding

Note for developers

API requests require authentication using HTTP Basic Authentication with an API key. The API key serves as the username, while the password field should be left empty. The format to encode is: your_api_key: (note the trailing colon).

This string must be Base64-encoded and included in the request's Authorization header as follows:

Authorization: Basic encoded_value

You can generate the encoded value using a trusted Base64 encoder.

Postman collection

Try it with Postman: Explore the API using Blueshift's Postman collection.

Things to know before you start

Finding template UUID: Template UUIDs can be found by querying the List email templates API, or from the URL when viewing a template in Blueshift: https://app.getblueshift.com/dashboard#/email_template_studio/<TEMPLATE_UUID>/edit/info.
JSON escaping: Ensure HTML content is properly escaped as a quoted string literal. Use \" instead of " for quotes within content. You can use this online tool to validate your JSON.
Removing configurations: Leaving external_fetches or transaction_mixins blank will remove previously added configurations. For account_algorithm_uuid, send null to remove the recommendation scheme.
Transaction mixins: Multiple transaction mixins use OR logic - results include transactions matching ANY of the criteria.
Use case: Best for programmatically updating template content, bulk template modifications, and automated template management.

Request parameters

Check out the request parameters

Path parameters

Parameter	Type	Required	Description
`TEMPLATE_UUID`	`string`	✅ Yes	The UUID of the email template to update.

Body parameters

Note: All body parameters are optional. Only include fields you want to update.

Parameter	Type	Required	Description
`resource`	`object`	❌ No	Template content object. See structure below.
`skip_user_on_external_fetch_error`	`boolean`	❌ No	Message is not sent to user if external fetch encounters an error. Default: `true`.
`template_properties`	`array`	❌ No	Campaign behavior properties (max 1 item). See structure below.
`external_fetches`	`array`	❌ No	External fetch UUIDs. Leaving blank removes existing fetches.
`transaction_mixins`	`array`	❌ No	Transaction mixin UUIDs. Leaving blank removes existing mixins.

Resource object

Parameter	Type	Description
`subject`	`string`	Specify the subject line of the template.
`preheader`	`string`	Specify the preheader line of the template.
`content`	`string`	Specify the HTML body of the template.

Template properties object

Parameter	Type	Description
`skip_user_on_blank_products`	`boolean`	Skip user if products are blank. Default: `true`.
`skip_user_on_blank_event_products`	`boolean`	Skip user if event products are blank. Default: `true`.
`account_algorithm_uuid`	`string`	Recommendation scheme UUID. Leave blank for no change, send `null` to remove existing scheme.

Example requests & responses

Update template content

Request

curl --request PUT \
     --url https://api.getblueshift.com/api/v1/email_templates/1da9e1e8-feae-4ec3-be0a-7dba528590bb.json \
     --header 'accept: application/json' \
     --header 'authorization: Basic <YOUR_API_KEY>' \
     --header 'content-type: application/json' \
     --data '{
       "resource": {
         "subject": "Hey there {{user.firstname}}!",
         "preheader": "Recommendations just for you. Get it now!",
         "content": "<!DOCTYPE html>\n<html>\n<body>\nHello\n</body></html>"
       },
       "skip_user_on_external_fetch_error": true,
       "template_properties": [
         {
           "skip_user_on_blank_products": true,
           "skip_user_on_blank_event_products": true,
           "account_algorithm_uuid": "4879b1a3-ee24-3e13-a63c-da83674c0ca2"
         }
       ],
       "external_fetches": [
         {
           "uuid": "e789705f-3eb3-4e2a-a666-648dedae6g86"
         }
       ]
     }'

Response

{
  "status": "OK"
}

API error responses

Note
The following error codes are commonly returned by Blueshift APIs. Depending on the specific endpoint, not all may apply.

Status code	Description	Example responses
400 Bad Request	The request is invalid due to missing or incorrect parameters. This includes missing fields, invalid values, formatting issues, or conflicts such as duplicate data.	`{ "errors": { "name": ["can't be blank"] } }` `{ "errors": { "startdate": ["can't be blank"] } }`
401 Unauthorized	API authentication failed due to an invalid or missing API key.	`{ "message": "Not authorized" }`
403 Forbidden	The API key does not have sufficient permissions to perform this action.	`{ "message": "Permission denied" }`
404 Not Found	The specified campaign was not found. Verify the campaign UUID.	`{ "message": "Campaign not found" }`
422 Unprocessable Entity	The campaign cannot be paused due to its current status (e.g., already completed or archived). One or more scheduling parameters may be invalid (if applicable).	`{ "message": "Campaign cannot be paused in its current status." }` `{ "message": "Invalid schedule values" }`
429 Too Many Requests	The request limit has been exceeded. Reduce request frequency.	`{ "message": "Rate limit exceeded" }`
500 Internal Server Error	An unexpected server error occurred. Contact support if the issue persists.	`{ "message": "Internal Server Error - Please contact support for more information." }`
502 Bad Gateway	The server received an invalid response. Retry the request.	`{ "message": "Bad Gateway - Please retry the request." }`
503 Service Unavailable	The service is temporarily unavailable. Try again later.	`{ "message": "Service Unavailable - The service is temporarily unavailable. Try again later." }`
504 Gateway Timeout	The server took too long to respond. Retry the request with exponential backoff.	`{ "message": "Gateway Timeout - The server took too long to respond. Retry with exponential backoff." }`