Slack username is empty

I have an integration that consumes the messages from the slack and , via the data mapper, maps the username and text value to the SQL query. (`insert into CONTACT values (:#AUTOR , 'Surname', :#COMPANY , 'some lead', '1999-01-01')`)

When I send a message to the chat, the integration is invoked and performs and SQL query. However, only text is saved and the username is empty:

sampledb=# select * from sampledb.contact;
 first_name | last_name |      company      | lead_source | create_date
------------+-----------+-------------------+-------------+-------------
            | Surname     | Red Hat testSlack | some lead   | 1999-01-01

I have updated the integration to the attachments. (without credentials, so you have to edit it and use your slack credentials)