public static void Exec(MercatorUi.MovableControls.MovableButton clickedButton)
{
    // enter your customized code here
    MercatorUi.Forms.Action.ActionForm actionForm = (MercatorUi.Forms.Action.ActionForm)clickedButton.Form;
    MercatorUi.Forms.Other.OtherClasses.PeppolBoxHelper.PeppolMessage peppolMessage =
        MercatorUi.Forms.Other.OtherClasses.PeppolBoxHelper.PeppolMessageFromAction(actionForm.ActionEngine);
    actionForm.Close();
    peppolMessage?.StartImportIntoBilling(new MercatorUi.Engine.Crm.Tools.ActionDescriptor(actionForm.ActionEngine));
}