[Flutter] Flutter Bluetooth Thermal Printer integration

I have a flutter food delivery app. Apart from that, I have a separate restaurant app where I accept and decline orders. I have been trying for a long time to be able to do something so that when the restaurant accepts the order, an automatic receipt will come out in a Bluetooth thermal printer. I found a lot of codes but I don't understand how I can enter these codes in an existing project.

E.g. In lib / view / screens I have the command page screen which is this:

if(orderModel.orderStatus == 'pending' && (orderModel.orderType == 'take_away'
|| Get.find<SplashController>().configModel.orderConfirmationModel != 'deliveryman')) {
Get.dialog(ConfirmationDialog(
icon: Images.warning, title: 'are_you_sure_to_confirm'.tr, description: 'you_want_to_confirm_this_order'.tr,
onYesPressed: () {
orderController.updateOrderStatus(orderModel.id, 'confirmed', back: true).then((success) {
if(success) {
Get.find<AuthController>().getProfile();
Get.find<OrderController>().getCurrentOrders();
}
});
},


I would like here, when the user presses the Confirm button, to enter a code that will send the automatic receipt to the thermal printer via bluetooth. ((onYesPressed))

I've seen a lot of github, but I don't understand where to add that code. Because that's a new project, but I want to add these codes to my current application. Can someone please explain to me in detail how I should proceed?

Thank you very much,

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