Subscribes a lead to a specified sequence, at a particular step within the sequence. That step is defined by the step’s box number. Note that the sequence and the step number must be already created in your account (https://app.kartra.com/communication/sequences).
| Type | Parameters | Values | 
| POST | cmd* | subscribe_lead_to_sequence_at_step | 
| POST | sequence_name* | string | 
| POST | step* | string | 
* Required fields Here is an example:
'lead' => [
    'email' => 'example@email.com'
],
'actions' => [
    '0' => [
        'cmd' => 'subscribe_lead_to_sequence_at_step',
        'sequence_name' => 'Sequence name',
        'step' => '1'
    ]
]
Success message:
{
  "status": "Success",
  "message": "Lead added to sequence",
  "type": "107"
}Error Cases:
| Type Number | Message | Cause | 
| 226 | Sequence cannot be empty | 
 | 
| 225 | Step cannot be empty | 
 | 
| 219 | Sequence does not exist | 
 | 
| 229 | Step has to be alphanumeric | 
 | 
| 230 | Step does not exist | 
 | 
{
  "status": "Error",
  "message": "Sequence cannot be empty",
  "type": "226"
}