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Merge Freeze Documentation
Connecting to Github
Implementing a merge freeze
Recurring freezes
Slack integration
Web API
Uninstalling Merge Freeze
Frequently asked questions
Web API
Availability
The Web API can be used on any public repository that has been set up in Merge Freeze, or private repositories if your account subscribes to the Proactive plan.
Access tokens
Before using the API you must first generate an access token. These access tokens do not expire. If you feel that your access token has been compromised and you’d like to generate another one you can simply click “Regenerate” to create a new one. Please note, however, that your old access token will cease to work from that point onwards.
There are two types of access tokens:
Project specific access tokens
Project specific access tokens only let you get information or freeze / unfreeze the project that relates to that specific access token. They can be generated in the Web API panel of each project.
Organization access tokens (organizations only)
Organization access tokens can get information or freeze / unfreeze any project that has been set up in Merge Freeze and belongs to your organization. To generate these access tokens your Github account must be an organization (not an individual) and you must be an administrator of the organization.
Assuming you meet the above criteria you'll find the organization access token in your organization settings in the Merge Freeze UI.
GET freeze status
If you want to implement a complete code freeze it may not be enough to simply stop people merging into your protected branch on Github, you may also want to block any deployments from happening in whatever software you use to push your code to production.
To achieve this we offer an endpoint for each project that provides JSON formatted data about whether there is currently a merge freeze in place or not. By querying this endpoint you can add a condition in your deployment script to only continue if your protected branch is not frozen.
The HTTP method and url to get your protected branch’s Merge Freeze data is as follows: GET https://www.mergefreeze.com/api/branches/[Github account name]/[Github repository name]/[protected branch name]/?access_token=[Access token] 
The exact url for your project can be found in the "Web API" panel of your project.
The endpoint will return the following fields:
Field name
Data type
Description
branch
String
The name of the protected branch
repository
String
The full name (account + repository name)  of the protected branch’s Github repository
frozen
Boolean
Whether or not there is currently a merge freeze in place
frozen_by
String or Null
The name of the person who implemented the merge freeze (may be “scheduled freeze” if a recurring freeze is responsible for the frozen state, or “slack user” if a Slack user has implemented a merge freeze but we don’t have their name).

Will return null if there is no merge freeze currently in place.
For example:
{
  "branch": "master",
  "repository": "Team-FooBar/My-App",
  "frozen": true,
  "frozen_by": "John Wick"
}
POST freeze status
In certain situations you may also want to programmatically freeze or unfreeze a branch. This can be done via the following endpoint:POST https://www.mergefreeze.com/api/branches/[Github account name]/[Github repository name]/[protected branch name]/?access_token=[Access token]
You must also send the following parameters either by including them as json in the body of the request or as form data:
Field name
Data type
Description
frozen
Boolean
true if you want the project to be frozen.
false if you'd like the project to be unfrozen.
user_name
String
The name of the person implementing the change.
note
String
A reason for the freeze request. Does not work on "unfreezes." Note: GitHub interface only shows around 50 characters.
The exact url for your project and an example using curl can be found in the "Web API" panel of your project.
This endpoint will return the same fields as the "GET freeze status" endpoint above.
Errors/warnings
If a required parameter is missing or invalid you will receive an HTTP 400 status with a json payload containing an error field describing the error.
If you attempt to freeze a project that is already frozen (or unfreeze an unfrozen project) the change will not take place but you will still receive an HTTP 200 status, although you will receive a warning field in the response describing the warning in addition to the normal fields returned in a successful response. 
Create branches
[New - June 2022] If your dev cycle involves switching between branch names on a per week or sprint basis, it can be cumbersome to recreate projects in the Merge Freeze UI.
With a simple API request you may instead set up (+ destroy) new projects remotely to save some time.
curl -d "account=merge-freeze&access_token=xxx&repository=core&branch=master&frozen=true" \
-X POST https://www.mergefreeze.com/api/branches
NOTE: this feature is currently in private beta. Email us your Github organization slug (e.g. /AcmeCo) to gain access.
Required body parameters:
Field name
Data type
Description
account
String
Github organization slug.
access_token
String
"Organization-wide" token; generate this on your Installation view (different from Branch API token -  only account admins can see this UI).
repository
String
Repository slug on Github.
branch
String
Name of the branch. This can be changed later in the UI.
Optional body parameters:
Field name
Data type
Description
frozen
Boolean
Sets branch to frozen when true. Default false.
tz
String
E.g. UTC. Defaults to your most recently created branch's timezone.
generate_access_token
Boolean
Creates an API token for freezing/unfreezing this branch when true. Default false.
freeze_method
String
Can be "update_all_pull_requests" or "update_branch_protection_rule", defaults to update all pull requests.
admins_only
Boolean
Only admins can modify this branch when set to true. Default false.
Branch details (API token if requested, frozen status, etc) will be available in the response object.
Delete branches
Similar to creating branches via the API, this endpoint requires an organization level access token.
curl -d "account=merge-freeze&access_token=xxx&repository=core&branch=master" \
-X DELETE https://www.mergefreeze.com/api/branches
Required body parameters:
Field name
Data type
Description
account
String
Github organization slug.
access_token
String
"Organization-wide" token; generate this on your Installation view (different from Branch API token -  only account admins can see this UI).
repository
String
Repository slug on Github.
branch
String
Name of the branch.
Allow deployments but block merging
If you’d like to perform a deployment while still keeping a merge freeze in place you can click the “Allow deployments” button. This button only shows up if your branch is currently frozen and you have created an access token for the Web API (an indication that you may be using it).
Clicking this button will change the Web API response’s frozen field to false but the merge freeze will stay on in all other places, so your team members will not be able to merge into the protected branch.
This can be undone by clicking the “Undo” link.
Rate limits
To prevent abuse requests are restricted to 100 per minute. Any requests exceeding this threshold will return a 429 error code and a RateLimit-Reset header with a time stamp indicating when the rate limit time period will be reset.
Slack integration
Uninstalling Merge Freeze
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Outline
Availability
Access tokens
Project specific access tokens
Organization access tokens (organizations only)
Allow deployments but block merging
Rate limits