Delete API from Web with listview

I have made a app where I can send a message to a web api. Its working fine. When I send the message, I get it also in a listview. I am now trying to delete the message trough my app from the API website. Is that possible?

When I click on the message from listview in my app it’s disappear from the phone, but not from the api. How can I make this work? This is my blocks for that. What am I doing wrong? I need it to delete from the website also.

what API are you talking about?
any link to its documentation?


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