Introduction

Welcome to the Cronhooks API! You can use our API to access Cronhooks API endpoints, which can get information on your scheduled webhooks.

Schedules

Schedule a new webhook

  curl https://api.cronhooks.io/schedules /
  -X POST \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <YOUR_API_TOKEN>' \
  -d \
  '{
     "groupId": null | group_id,
     "title": "Send email to inactive users",
     "description": "Send an email to users who are inactive for more than 60 days and offer a discount for upgrading subscriptions.",
     "url": "https://example.com/webhooks/inactive-email",
     "timezone": "asia/karachi",
     "method": "POST",
     "headers": {
       "additionalProp1": "string",
       "additionalProp2": "string",
       "additionalProp3": "string"
     },
     "payload": {
       "additionalProp1": "string",
       "additionalProp2": "string",
       "additionalProp3": "string"
     },
     "contentType": "application/json; charset=utf-8",
     "isRecurring": false,
     "cronExpression": "",
     "runAt": "2019-02-01T12:48:26.983", // if isRecurring => false
     "sendCronhookObject": true,
     "sendFailureAlert": true,
     "startsAt": "2023-02-01T13:00:00", // if isRecurring => true
     "endsAt": "2023-03-01T13:00:00" // if isRecurring => true
     "retryCount": "3", // if isRecurring => false
     "retryIntervalSeconds": "5" // if isRecurring => false
  }'

{
  "id": "3a012d1f-fe83-4855-2860-84f8a85e154c",
  "groupId": "3a0136ac-123f-c222-5b2d-ae5b0c5937a6",
  "title": "Send email to inactive users",
  "description": "Send an email to users who are inactive for more than 60 days and offer a discount for upgrading subscriptions.",
  "url": "https://example.com/webhooks/inactive-email",
  "timezone": "asia/karachi",
  "method": "POST",
  "headers": {
    "additionalProp1": "string",
    "additionalProp2": "string",
    "additionalProp3": "string"
  },
  "payload": "{
      \"additionalProp1\": \"string\",
      \"additionalProp2\": \"string\",
      \"additionalProp3\": \"string\"
  }",
  "contentType": "application/json; charset=utf-8",
  "status": "scheduled",
  "errorMessage": "",
  "isRecurring": false,
  "cronExpression": "",
  "runAt": "2019-02-01T12:48:26.983",
  "sendCronhookObject": true,
  "sendFailureAlert": true,
  "startsAt": "2023-02-01T13:00:00",
  "endsAt": "2023-03-01T13:00:00",
  "retryCount": "3",
  "retryIntervalSeconds": "5",
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

This endpoint creates a new scheduled webhook.

HTTP Request

POST https://api.cronhooks.io/schedules

Parameters

Parameter	Required	Description
groupId	`Optional`	provide group's id
title	`Required`	title of webhook schedule
url	`Required`	webhook url
timezone	`Required`	IANA Timezone
method	`Required`	Http METHOD
headers	`Optional`	{} Object
payload	`Optional`	{} Object or "" String
contentType	`Required`	Content Type for recieving webhook
isRecurring	`Required`	Trigger webhook repeatedly or not
runAt	`Required`	if isRecurring => false, Webhook will be triggered at given DateTime
sendCronhookObject	`Required`	Send Cronhook schedule object along with provided payload
sendFailureAlert	`Required`	If `false` no alerts will be sent on any channel
cronExpression	`Required`	if isRecurring => true, Valid cron expression for recurring schedules
startsAt	`Optional`	if isRecurring => true, Webhook will start at given DateTime
endsAt	`Optional`	if isRecurring => true, Webhook will end at given DateTime
retryCount	`Optional`	if isRecurring => false
retryIntervalSeconds	`Optional`	if isRecurring => false

retryCount max value is 3. retryIntervalSeconds max value is 300.

List Schedules

curl "https://api.cronhooks.io/schedules?skip=0&limit=10"
  -H "Authorization: Bearer <YOUR_API_KEY>"

{
  "totalCount": 0,
  "items": [
    {
      "id": "3a012d1f-fe83-4855-2860-84f8a85e154c",
      "groupId": "3a0136ac-123f-c222-5b2d-ae5b0c5937a6",
      "title": "Send email to inactive users",
      "description": "Send an email to users who are inactive for more than 60 days and offer a discount for upgrading subscriptions.",
      "url": "https://example.com/webhooks/inactive-email",
      "timezone": "asia/karachi",
      "method": "POST",
      "headers": {
        "additionalProp1": "string",
        "additionalProp2": "string",
        "additionalProp3": "string"
      },
      "payload": "{
        \"additionalProp1\": \"string\",
        \"additionalProp2\": \"string\",
        \"additionalProp3\": \"string\"
      }",
      "contentType": "application/json; charset=utf-8",
      "status": "scheduled",
      "errorMessage": "",
      "isRecurring": false,
      "cronExpression": "",
      "runAt": "2019-02-01T12:48:26.983",
      "sendCronhookObject": true,
      "sendFailureAlert": true,
      "startsAt": "2023-02-01T13:00:00",
      "endsAt": "2023-03-01T13:00:00",
      "retryCount": "3",
      "retryIntervalSeconds": "5",
      "creationTime": "2019-02-01T09:35:27.568Z",
      "lastModificationTime": "2019-02-01T09:35:27.568Z"
    }
  ]
}

This endpoint retrieves all scheduled webhooks.

HTTP Request

GET https://api.cronhooks.io/schedules?skip=0&limit=10

Query Parameters

Parameter	Required	Description
skip	`Required`	Number of records to skip.
limit	`Required`	Number of records to return in response.

Retrieve a Scheduled Webhook

curl "https://api.cronhooks.io/schedules/3a012d1f-fe83-4855-2860-84f8a85e154c"
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
  "id": "3a012d1f-fe83-4855-2860-84f8a85e154c",
  "groupId": "3a0136ac-123f-c222-5b2d-ae5b0c5937a6",
  "title": "Send email to inactive users",
  "description": "Send an email to users who are inactive for more than 60 days and offer a discount for upgrading subscriptions.",
  "url": "https://example.com/webhooks/inactive-email",
  "timezone": "asia/karachi",
  "method": "POST",
  "headers": {
    "additionalProp1": "string",
    "additionalProp2": "string",
    "additionalProp3": "string"
  },
  "payload": "{
      \"additionalProp1\": \"string\",
      \"additionalProp2\": \"string\",
      \"additionalProp3\": \"string\"
  }",
  "contentType": "application/json; charset=utf-8",
  "status": "scheduled",
  "errorMessage": "",
  "isRecurring": false,
  "cronExpression": "",
  "runAt": "2019-02-01T12:48:26.983",
  "sendCronhookObject": true,
  "sendFailureAlert": true,
  "startsAt": "2023-02-01T13:00:00",
  "endsAt": "2023-03-01T13:00:00",
  "retryCount": "3",
  "retryIntervalSeconds": "5",
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

This endpoint retrieves a specific schedule.

HTTP Request

GET https://api.cronhooks.io/schedules/{id}

URL Parameters

Parameter	Required	Description
id	`Required`	The ID of the schedule to retrieve

Update Scheduled Webhook

curl "https://api.cronhooks.io/schedules/3a0136ac-123f-c222-5b2d-ae5b0c5937a6"
  -X PUT \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <YOUR_API_TOKEN>' \
  -d \
  '{
     "groupId": null | group_id,
     "title": "Send email to inactive users",
     "description": "Send an email to users who are inactive for more than 60 days and offer a discount for upgrading subscriptions.",
     "url": "https://example.com/webhooks/inactive-email",
     "timezone": "asia/karachi",
     "method": "POST",
     "headers": {
       "additionalProp1": "string"
     },
     "payload": {
       "additionalProp1": "string",
       "additionalProp2": "string",
       "additionalProp3": "string",
       "additionalProp4": "string"
     },
     "contentType": "application/json; charset=utf-8",
     "isRecurring": true,
     "cronExpression": "*/5 * * * *",
     "sendCronhookObject": true,
     "sendFailureAlert": true,
     "retryCount": "1",
     "retryIntervalSeconds": "5",
     "startsAt": "2023-02-01T13:00:00",
     "endsAt": "2023-03-01T13:00:00"
  }'

{
  "id": "3a012d1f-fe83-4855-2860-84f8a85e154c",
  "groupId": "3a0136ac-123f-c222-5b2d-ae5b0c5937a6",
  "title": "Send email to inactive users",
  "description": "Send an email to users who are inactive for more than 60 days and offer a discount for upgrading subscriptions.",
  "url": "https://example.com/webhooks/inactive-email",
  "timezone": "asia/karachi",
  "method": "POST",
  "headers": {
    "additionalProp1": "string"
  },
  "payload": "{
     \"additionalProp1\": \"string\",
     \"additionalProp2\": \"string\",
     \"additionalProp3\": \"string\"
   }",
  "contentType": "application/json; charset=utf-8",
  "isRecurring": true,
  "cronExpression": "*/5 * * * *",
  "nextRunAt": "2019-02-01T12:48:26.983",
  "sendCronhookObject": true,
  "sendFailureAlert": true,
  "startsAt": "2023-02-01T13:00:00",
  "endsAt": "2023-03-01T13:00:00",
  "retryCount": "1",
  "retryIntervalSeconds": "5",
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

This endpoint updates a scheduled webhook.

HTTP Request

PUT https://api.cronhooks.io/schedules/{id}

Parameters

Parameter	Required	Description
groupId	`Optional`	provide group's id
id	`Required`	id of updated schedule
title	`Required`	title of webhook schedule
url	`Required`	webhook url
timezone	`Required`	IANA Timezone
method	`Required`	Http METHOD
headers	`Optional`	{} Object
payload	`Optional`	{} Object or "" String
contentType	`Required`	Content Type for recieving webhook
isRecurring	`Required`	Trigger webhook repeatedly or not
runAt	`Required`	if isRecurring => false, Webhook will be triggered at given DateTime
cronExpression	`Required`	if isRecurring => true, Valid cron expression for recurring schedules
sendCronhookObject	`Required`	Send Cronhook schedule object along with provided payload
sendFailureAlert	`Required`	If `false` no alerts will be sent on any channel
startsAt	`Optional`	if isRecurring => true, Webhook will start at given DateTime
endsAt	`Optional`	if isRecurring => true, Webhook will end at given DateTime
retryCount	`Optional`	if isRecurring => false
retryIntervalSeconds	`Optional`	if isRecurring => false

Trigger Webhook

curl "https://api.cronhooks.io/schedules/3a012d1f-fe83-4855-2860-84f8a85e154c/trigger"
  -X POST
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
    "error": {
        "code": null,
        "message": "error message",
        "details": null,
        "data": null,
        "validationErrors": null
    }
}

This endpoint triggers a specific webhook immediately. It does not affect the schedule.

HTTP Request

POST https://api.cronhooks.io/schedules/{id}/trigger

URL Parameters

Parameter	Required	Description
id	`Required`	The ID of the schedule to trigger

Pause Schedule

curl "https://api.cronhooks.io/schedules/3a012d1f-fe83-4855-2860-84f8a85e154c/pause"
  -X POST
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
    "error": {
        "code": null,
        "message": "error message",
        "details": null,
        "data": null,
        "validationErrors": null
    }
}

This endpoint pause's given schedule.

HTTP Request

POST https://api.cronhooks.io/schedules/{id}/pause

URL Parameters

Parameter	Required	Description
id	`Required`	The ID of the schedule

Resume Schedule

curl "https://api.cronhooks.io/schedules/3a012d1f-fe83-4855-2860-84f8a85e154c/resume"
  -X POST
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
    "error": {
        "code": null,
        "message": "error message",
        "details": null,
        "data": null,
        "validationErrors": null
    }
}

This endpoint resume's given schedule.

HTTP Request

POST https://api.cronhooks.io/schedules/{id}/resume

URL Parameters

Parameter	Required	Description
id	`Required`	The ID of the schedule

Delete Scheduled Webhook

curl "https://api.cronhooks.io/schedules/3a012d1f-fe83-4855-2860-84f8a85e154c"
  -X DELETE
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
    "error": {
        "code": null,
        "message": "error message",
        "details": null,
        "data": null,
        "validationErrors": null
    }
}

This endpoint deletes a specific schedule.

HTTP Request

DELETE https://api.cronhooks.io/schedules/{id}

URL Parameters

Parameter	Required	Description
id	`Required`	The ID of the schedule to delete

Groups

List Groups

curl "https://api.cronhooks.io/groups?skip=0&limit=10"
  -H "Authorization: Bearer <YOUR_API_KEY>"

{
  "totalCount": 2,
  "items": [
    {
      "id": "3a012d1f-fe83-4855-2860-84f8a85e154c",
      "name": "Group #1",
      "environmentVariables": [{
        "key": "BASE_URL",
        "value": " https://example.com",
        "protected": false
      }],
      "creationTime": "2019-02-01T09:35:27.568Z",
      "lastModificationTime": "2019-02-01T09:35:27.568Z"
    },
    {
      "id": "3a013346-7e3d-eaa5-feee-371f5f8614ad",
      "name": "Group #2",
      "environmentVariables": [],
      "creationTime": "2019-02-01T09:35:27.568Z",
      "lastModificationTime": "2019-02-01T09:35:27.568Z"
    }
  ]
}

This endpoint retrieves all groups.

HTTP Request

GET https://api.cronhooks.io/groups?skip=0&limit=10

Query Parameters

Parameter	Required	Description
skip	`Required`	Number of records to skip.
limit	`Required`	Number of records to return in response.

Retrieve Group by Id

curl "https://api.cronhooks.io/groups/3a013346-7e3d-eaa5-feee-371f5f8614ad"
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
  "id": "3a013346-7e3d-eaa5-feee-371f5f8614ad",
  "name": "Group #1",
  "environmentVariables": [{
    "key": "BASE_URL",
    "value": " https://example.com",
    "protected": false
  }],
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

This endpoint retrieves a specific group.

HTTP Request

GET https://api.cronhooks.io/groups/{id}

URL Parameters

Parameter	Required	Description
id	`Required`	Group Id

Retrieve Group by Name

curl "https://api.cronhooks.io/groups/getByName?name=Group%20%231"
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
  "id": "3a013346-7e3d-eaa5-feee-371f5f8614ad",
  "name": "Group #1",
  "environmentVariables": [{
    "key": "BASE_URL",
    "value": " https://example.com",
    "protected": false
  }],
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

{
    "error": {
        "code": null,
        "message": "There is no entity Group with name = Group #1!",
        "details": null,
        "data": null,
        "validationErrors": null
    }
}

This endpoint retrieves a specific group by name.

HTTP Request

GET https://api.cronhooks.io/groups/getByName?name=Group%20%231

URL Parameters

Parameter	Required	Description
name	`Required`	The url encoded (encodeURIComponent) group name

Retrieve or Create Group with Name

curl "https://api.cronhooks.io/groups/name"
  -X POST \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <YOUR_API_TOKEN>' \
  -d \
  '{
     "name": "Group #1",
     "environmentVariables": [{"key": "BASE_URL", "value": "https://example.com", protected: false}]
   }'

{
  "id": "3a013346-7e3d-eaa5-feee-371f5f8614ad",
  "name": "Group #1",
  "environmentVariables": [{
    "key": "BASE_URL",
    "value": " https://example.com",
    "protected": false
  }],
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

This endpoint retrieves a specific group by name. If group doesn't exist then it will be created on the fly.

HTTP Request

`POST https://api.cronhooks.io/groups/name

URL Parameters

Parameter	Required	Description
name	`Required`	The url encoded (encodeURIComponent) group name
environmentVariables	`Optional`	group variables.

Create Group

curl "https://api.cronhooks.io/groups"
  -X POST \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <YOUR_API_TOKEN>' \
  -d \
  '{
     "name": "Group #1",
     "environmentVariables": [{"key": "BASE_URL", "value": "https://example.com", protected: false}]
   }'

{
  "id": "3a013346-7e3d-eaa5-feee-371f5f8614ad",
  "name": "Group #1",
  "environmentVariables": [{
    "key": "BASE_URL",
    "value": " https://example.com",
    "protected": false
  }],
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

This endpoint creates a group.

HTTP Request

POST https://api.cronhooks.io/groups

Parameters

Parameter	Required	Description
name	`Required`	group name.
environmentVariables	`Optional`	group variables.

Update Group

curl "https://api.cronhooks.io/groups/3a013346-7e3d-eaa5-feee-371f5f8614ad"
  -X PUT \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <YOUR_API_TOKEN>' \
  -d \
  '{
     "name": "Group #2",
     "environmentVariables": [{"key": "BASE_URL", "value": "https://example.com", protected: false}]
   }'

{
  "id": "3a013346-7e3d-eaa5-feee-371f5f8614ad",
  "name": "Group #2",
  "environmentVariables": [{
    "key": "BASE_URL",
    "value": " https://example.com",
    "protected": false
  }],
  "creationTime": "2019-02-01T09:35:27.568Z",
  "lastModificationTime": "2019-02-01T09:35:27.568Z"
}

This endpoint updates a group.

HTTP Request

PUT https://api.cronhooks.io/groups/{id}

Parameters

Parameter	Required	Description
id	`Required`	group id.
name	`Required`	group name.
environmentVariables	`Optional`	group variables.

Delete Group

curl "https://api.cronhooks.io/groups/3a013346-7e3d-eaa5-feee-371f5f8614ad"
  -X DELETE
  -H "Authorization: Bearer <YOUR_API_TOKEN>"

{
    "error": {
        "code": null,
        "message": "error message",
        "details": null,
        "data": null,
        "validationErrors": null
    }
}

This endpoint deletes a specific group. All groups schedules will also be deleted.

HTTP Request

DELETE https://api.cronhooks.io/groups/{id}

URL Parameters

Parameter	Required	Description
id	`Required`	The ID of the group to delete

List Group Schedules

curl "https://api.cronhooks.io/groups/{groupId}/schedules?skip=0&limit=10"
  -H "Authorization: Bearer <YOUR_API_KEY>"

{
  "totalCount": 2,
  "items": [
    {
      "id": "3a013346-7e3d-eaa5-feee-371f5f8614ad",
      "groupId": "3a012d1f-fe83-4855-2860-84f8a85e154c",
      "title": "Send email to inactive users",
      "description": "Send an email to users who are inactive for more than 60 days and offer a discount for upgrading subscriptions.",
      "url": "{{BASE_URL}}/webhooks/inactive-email",
      "timezone": "asia/karachi",
      "method": "POST",
      "headers": {
        "additionalProp1": "string"
      },
      "payload": "{}",
      "contentType": "application/json; charset=utf-8",
      "isRecurring": true,
      "cronExpression": "*/5 * * * *",
      "nextRunAt": "2019-02-01T12:48:26.983",
      "sendCronhookObject": true,
      "sendFailureAlert": true,
      "startsAt": "2023-02-01T13:00:00",
      "endsAt": "2023-03-01T13:00:00",
      "retryCount": "1",
      "retryIntervalSeconds": "5",
      "creationTime": "2019-02-01T09:35:27.568Z",
      "lastModificationTime": "2019-02-01T09:35:27.568Z"
    }
  ]
}

This endpoint retrieves all schedules for a given group.

HTTP Request

GET https://api.cronhooks.io/groups/{groupId}/schedules?skip=0&limit=10

Query Parameters

Parameter	Required	Description
groupId	`Required`	group id
skip	`Required`	Number of records to skip.
limit	`Required`	Number of records to return in response.

Environment Variables (Global)

Group & global environment variables can be used in webhook URLs, headers and payload. Use {{CUSTOM_VAR}} notation. Group level variables override global variables, if they have same name. Variables are case sensitive.

List Environment Variables

curl "https://api.cronhooks.io/environment-variables"
  -H "Authorization: Bearer <YOUR_API_KEY>"

{
  "items": [
    {
      "key": "BASE_URL",
      "value": "https://api.cronhooks.io",
      "protected": false
    },
    {
      "key": "API_KEY",
      "value": "key_b1c4553be9dab17879b4a2ba2c5aecc2c13cafef",
      "protected": true
    }
  ]
}

This endpoint retrieves all environment variables.

Update Environment Variables

curl "https://api.cronhooks.io/environment-variables"
  -X PUT \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer <YOUR_API_TOKEN>' \
  -d \
  '{
      overwrite: false,
      environmentVariables: [
      {
        "key": "API_SECRET",
        "value": "sec_b1c4553be9dab17879b4a2ba2c5aecc2c13cafef",
        "protected": true
      }
      ]
  }'

{
  "items": [
    {
      "key": "BASE_URL",
      "value": "https://api.cronhooks.io",
      "protected": false
    },
    {
      "key": "API_KEY",
      "value": "key_b1c4553be9dab17879b4a2ba2c5aecc2c13cafef",
      "protected": true
    },
    {
      "key": "API_SECRET",
      "value": "sec_b1c4553be9dab17879b4a2ba2c5aecc2c13cafef",
      "protected": true
    }
  ]
}

This endpoint environment variables.

HTTP Request

PUT https://api.cronhooks.io/environment-variables

Parameters

Parameter	Required	Description
overwrite	`Required`	Overwrite existing variables.
environmentVariables	`Required`	Variables.

overwrite: true will remove all existing variables and update with new variables. overwrite: false will append new variables and update with new value if a variable already exists.

HTTP Request

PUT https://api.cronhooks.io/environment-variables

System Variables

These variables can be directly used in your schedules.

_CRONHOOK_ID - Id of schedule
_RANDOM - a random number
_UUID - a random guid
_TIMESTAMP - unix timestamp (seconds)

Escape Braces

If you need to escape curly braces you can use this notation:

{%{ {{ escaped_string }} }%} // output => {{ escaped_string }}

Notifications Integrations

Webhook

{
  "action": "webhook.failed",
  "webhook":
  {
    ...
  }
}

A POST request will be sent to your provided webhook in case of failure if your shceduled webhook does not return 2xx status code.

Slack

In order to integrate Slack with your cronhooks account, you should follow these steps.

Go to the "Alerts" page from top right menu of "User Name" and there you will see "Add to Slack" button. Click on it.
"Add to Slack" button will redirect you to the Slack auth page where you can choose the channel you want to get Cronhooks alerts to (see the screenshot below).
After choosing the channel "Authorize" it and you will be redirected back to Cronhooks alerts page. Here you can see all your Slack channels in the list. You can add & delete as many channels as you like.

You can read our privacy policy here.

Webhook Signature Verification

To verify the the authenticity that your scheduled webhook was triggered by cronhooks you can check the signature.

ASP.NET / C#

[Route("api/[controller]")]
public class CronhooksFailureWebHook : Controller
{
    // You can find your endpoint's secret in your API Keys settings
    const string secret = "wh_...";

    [HttpPost]
    public void Index()
    {
      var json = new StreamReader(HttpContext.Request.Body).ReadToEnd();
      var computedSignature = ComputeSignature(secret, json);
      var cronhooksSignature = Request.Headers["Cronhooks-Signature"];

      if (SecureCompare(computedSignature, cronhooksSignature))
      {
        // Verified
      }
    }

    private string ComputeSignature(string secret, string payload)
    {
      var secretBytes = Encoding.UTF8.GetBytes(secret);
      var payloadBytes = Encoding.UTF8.GetBytes(payload);

      using (var cryptographer = new HMACSHA256(secretBytes))
      {
        var hash = cryptographer.ComputeHash(payloadBytes);
        return BitConverter.ToString(hash).Replace("-", string.Empty).ToLowerInvariant();
      }
    }

    private bool SecureCompare(string a, string b)
    {
      if (a.Length != b.Length)
      {
        return false;
      }

      var result = 0;
      for (var i = 0; i < a.Length; i++)
      {
        result |= a[i] ^ b[i];
      }
      return result == 0;
    }
}

PHP


  $webhook_secret = 'wh_...';

  $payload = @file_get_contents('php://input');
  $cronhooks_sig_header = $_SERVER['HTTP_CRONHOOKS_SIGNATURE'];

  $signature = computeSignature($payload, $webhook_secret);

  if(secureCompare($cronhooks_sig_header, $signature)){
    // Verified
  }

  private function computeSignature($payload, $secret){
     return hash_hmac("sha256", $payload, $secret);
  }

  private function secureCompare($secret, $computed){
    if(function_exists('hash_equals')){
      return hash_equals($secret, $computed);
    }

    if (strlen($secret) != strlen($computed)) {
      return false;
    }

    $result = 0;
    for ($i = 0; $i < strlen($secret); $i++) {
      $result |= ord($secret[$i]) ^ ord($computed[$i]);
    }
    return ($result == 0);
  }

Typescript / Node


  import crypto from 'crypto'

  const cronhooksSignature = req.headers['cronhooks-signature']; // req.headers['Cronhooks-Signature']

  let body = rawBody.toString();

  const expectedSignature = crypto
    .createHmac('sha256', process.env.CRONHOOKS_SECRET)
    .update(body)
    .digest('hex');

  let isValidRequest = (cronhooksSignature !== expectedSignature);

Errors

The Cronhooks API uses the following error codes:

Error Code	Meaning
400	Bad Request -- Your request is invalid.
401	Unauthorized -- Your API key is wrong.
404	Not Found -- The specified resource could not be found.
405	Method Not Allowed -- You tried to access a resource with an invalid method.
406	Not Acceptable -- You requested a format that isn't json.
429	Too Many Requests -- You're accessing API with too many requests
500	Internal Server Error -- We had a problem with our server. Try again later.
503	Service Unavailable -- We're temporarily offline for maintenance. Please try again later.