Welcome back to icliniq.com.
I hope you would have already been appraised about how the procedure works in weight reduction.
It is oversewing the stomach mucosa to each other thus narrowing the lumen of the stomach and hence, restricting the ability to consume more significant portions of food leading to weight loss. It is relatively safe. But like all procedures in medical practice, it has its risk profile in the long term, of developing GERD (reflux symptoms), decreased acid production, early satiety, none of which are severe.
As everything in medical practice it is the balance of benefit versus risk, and in your case probably the benefit outweighs the risk (though I am not sure, what exactly was the reason why you have advised this procedure for weight reduction).