Updates to existing segmentation lists can be performed from MOs sent from users. In this way new information can be added to each telephone number that it’s registered into that specific subscription list or information for specific fields can be updated from that MO.

In order to add a field to an existing list we should go from home to Menu in the upper left corner

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After clicking on Menu option we must go to Interactive Campaigns and Keywords

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Create a new Campaign or Edit an existing one and click on the **//Show Advanced Options//** link on the right top corner. Then, select the segmentation list you want to update from the combo next to the label **//Update Subscription List//** . 

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After that we must add the new parameters that will process the information from the MO and update or create the new field on the mobile numbers record by clicking on the **//Extended Attributes//** button

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^ Key                              ^ Description       ^
| CUSTOM_DISTRIBUTION_LIST_                | List ID where fields are going to be updated or created. This field is filled automatically once the subscription list is selected in the **//Show Advanced Options//** form|
| CUSTOM_METHOD | Method that is going to be used in order to add users (e.g. optin) it would be createUser and if we want to update any field (e.g. optout) it would be updateUser. **//Note: //** //The createUser method allows both operations create and update an user//|
| SERVICE_URL | This parameter will allow (true) or not (false) parameter's update from the list  |
| CUSTOM_PARAMETER_KEY_N | Name of the "N" parameter that will be modified  |
| CUSTOM_PARAMETER_VALUE_N | Value for "N" parameter that will be inserted  |

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<WRAP round tip>Due to internal processes, parameters **CUSTOM_PARAMETER_KEY_1** with value **customer_optin_status** and **CUSTOM_PARAMETER_VALUE_1** with value either **0** (for opt-out) or **1** (for opt-in) are mandatories</WRAP>

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Finally, set up the proper keyword and the response message for the campaign:

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In this example, according to the setup, every time an user texts **//mykeyword//** will be added to the list called //TestSegmentation// with a field called customer_optin_status whose value will be 1.