How to make a post(json) request in IVRFlow fop2 in Issabel

Question

I have this canvas in IVRFlow in fop2 in Issabel, i want to make a post(json) request to an api, but i can't do it.

here i set the codlink variable before to send it to the api:

this is the api call, the api need to recieve a codlink variable to make the request:

at the last in need to play the api answer, the api answer is like this:

[
    {
        "Mensaje": "Si su zona se encuentra sin Luz marque 1. Si se encuentra sin luz individual marque 2. \r\n\t\t\t\t\t\t\t\tSi registra problemas de alta tension marque 3.",
        "Error": null,
        "Codigo": "200",
        "Identificador": "18135002001273"
    }
]

here i try to play the Mensaje variable's content, but it doesnt work:

how can resolve it?