This API method is used to show whether an attachment is opened or not by the receiver.
| Parameter | Required | Type | Description | 
|---|---|---|---|
| apikey | yes | string | Your authorized API key | 
| secret | yes | string | Your authorized secret key | 
| user_id | yes | string | Unique Id for user | 
| business_id | yes | string | Unique Id for workspace | 
| text_id | yes | string | Unique Id for text | 
| contact_id | yes | string | Unique Id for contact | 
                                    {
	"status": "success",
	"status_code": 200,
	"message": "Text timeline list.",
	"result": [attachemnt objects]
}           
                                
                            | Error Code | Description | 
|---|---|
| 701 | User id parameter required | 
| 702 | User id is required | 
| 701 | Business id parameter required | 
| 702 | Business id required | 
| 610 | Invalid user id | 
| 610 | Invalid business id | 
| 613 | Invalid user and business | 
| 701 | Text Id parameter required | 
| 701 | Contact Id parameter required | 
                   
                                        {
        "error": {
        "reason": "parameter missing",
        "message": "User id parameter required",
        "field_name": "user_id",
        "code": 701,
        "error_type": "missing_parameter"
    }
}                                    
                                                   
                                        {
    "error": {
        "reason": "required field",
        "message": "User id is required",
        "code": 702,
        "error_type": "required"
    }
}                                    
                                                   
                                        {
    "error": {
        "reason": "parameter missing",
        "message": "Business id parameter required",
        "field_name": "business_id",
        "code": 701,
        "error_type": "missing_parameter"
    }
}                                    
                                                   
                                        {
    "error": {
        "reason": "required field",
        "message": "Business id required",
        "code": 702,
        "error_type": "required"
    }
}                                    
                                                   
                                        {
"error": {
"errors": [
{
"reason": "Invalid Id",
"message": "Please make sure you have provided the valid user id"
}
],
"code": 610,
"error_type": "reference_error"
}
}                                    
                                                   
                                        {
"error": {
"errors": [
{
"reason": "Invalid Id",
"message": "Please make sure you have provided the valid business id"
}
],
"code": 610,
"error_type": "reference_error"
}
}                                    
                                                   
                                        {
"error": {
"errors": [
{
"reason": "Invalid user and business",
"message": "The business and user id combination that you provided doesn't match in our record"
}
],
"code": 613,
"error_type": "invalid_user_business"
}
}                                    
                                                   
                                        {
        "error": {
        "reason": "parameter missing",
        "message": "Text id parameter required",
        "field_name": "text_id",
        "code": 701,
        "error_type": "missing_parameter"
    }
}                                    
                                                   
                                        {
        "error": {
        "reason": "parameter missing",
        "message": "Contact id parameter required",
        "field_name": "contact_id",
        "code": 701,
        "error_type": "missing_parameter"
    }
}                                    
                                  
                                                     
                                
                                               
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