Add subscribers based on subscriber ID to a new or existing tag.
Note: This API call can also be found under the requesttype of "Subscribers".
XML Request Example:
<xmlrequest> element
| Field Name | Description | 
| username | Username used to login to Pinpointe | 
| usertoken | Unique token assigned to Pinpointe account | 
| requesttype | Tags | 
| requestmethod | TagSubscribers | 
Please note: ALL OPTIONAL tags that are not used should be deleted from submitted call. if only one <tag></tag> and / or <subscriberid></subscriberid> element is/are being used, remove all unused elements. 
<details> element
<tag>
| Field Name | Description | 
| tag (Required) | ID of tag to be searched. At least one required. | 
| subscriberid | ID of subscriber being added to tag. At least one required. | 
Successful Response:
<response> element
| Field Name | Description | 
| status | Will return SUCCESS if contact(s) were successfully added to the tag(s). | 
| data | Tag count contact(s) were added to | 
Unsuccessful Response:
<response> element
| Field Name | Description | 
| status | Will return FAILED if unsuccessful | 
| errormessage | Text explaining why request failed |