An integrated combustion nozzle, comprising: a combustion liner extending along a radial direction between an inner liner segment and an outer liner segment, the combustion liner including a forward end portion axially separated from an aft end portion, a first side wall, and a second side wall, the aft end portion of the combustion liner defining a turbine nozzle, wherein the first side wall and the second side wall each defining a respective opening (170, 172) that extends both axially and radially; a unified head end coupled to the combustion liner, the unified head end being suitable to be in fluid communication with a fuel supply, wherein the unified head end comprises: a first fuel nozzle and a second fuel nozzle disposed at the forward end portion of the combustion liner, wherein a fuel plenum is defined between the first fuel nozzle and the second fuel nozzle; a first liner portion that extends from the first fuel nozzle and into the respective opening (170, 172) of the first side wall such that the first liner portion forms a continuous surface with the first side wall of the combustion liner; a second liner portion that extends from the second fuel nozzle and into the respective opening (170, 172) of the second side wall such that the second liner portion forms a continuous surface with the second side wall of the combustion liner. a combustion liner extending along a radial direction between an inner liner segment and an outer liner segment, the combustion liner including a forward end portion axially separated from an aft end portion, a first side wall, and a second side wall, the aft end portion of the combustion liner defining a turbine nozzle, wherein the first side wall and the second side wall each defining a respective opening (170, 172) that extends both axially and radially; a unified head end coupled to the combustion liner, the unified head end being suitable to be in fluid communication with a fuel supply, wherein the unified head end comprises: a first fuel nozzle and a second fuel nozzle disposed at the forward end portion of the combustion liner, wherein a fuel plenum is defined between the first fuel nozzle and the second fuel nozzle; a first liner portion that extends from the first fuel nozzle and into the respective opening (170, 172) of the first side wall such that the first liner portion forms a continuous surface with the first side wall of the combustion liner; a second liner portion that extends from the second fuel nozzle and into the respective opening (170, 172) of the second side wall such that the second liner portion forms a continuous surface with the second side wall of the combustion liner. a first fuel nozzle and a second fuel nozzle disposed at the forward end portion of the combustion liner, wherein a fuel plenum is defined between the first fuel nozzle and the second fuel nozzle; a first liner portion that extends from the first fuel nozzle and into the respective opening (170, 172) of the first side wall such that the first liner portion forms a continuous surface with the first side wall of the combustion liner; a second liner portion that extends from the second fuel nozzle and into the respective opening (170, 172) of the second side wall such that the second liner portion forms a continuous surface with the second side wall of the combustion liner.