Best way to bottle peri peri sauce?
Sorry to rain on your parade, but unless you use an acid which you forgot to mention, this is a happy breeding ground for botulism bacteria (Clostridium botulinum). 

You are creating anaerobic conditions with the oil, which means this specific bacteria are happy to multiply there.

Unfortunately, a simple boil, even for 20 minutes, won't make it safe. It will kill the live bacteria and even destroy the toxins they produced, but it will not kill the spores. 

To kill the spores, you need commercial pressure canning with temperatures of 121 C / 250 F. 

So you can keep the sauce for a limited time in a refrigerator (3 C or lower), but you must make sure your buyers realize that need, too.

To give you an idea of how poisonous the toxin is: 1kg is said to kill the entire human population, the lethal dose for an adult is about as much as a quarter grain of sand. And contaminated food can not be recognised by sight, smell or taste.