When we talk about external repair services but authorized by Apple, we enter with a wide range of stores ranging from the authorized resellers themselves that have official repair service, to the smaller stores specialized in repairs that do not sell Apple products directly. . In this sense, and during the coronavirus crisis, many of these retailers have seen their businesses affected and Apple just announced a help block for them with specific cleaning material, personal protective equipment (PPE) for them and other safety measures.
Apple has a network of authorized repair shops where many company product repairs are performed that cannot be absorbed from Apple itself. These technicians have all the official certificates of the firm to carry out any repair and they are a very important part for Apple since the volume of products currently on the market is very high, so this type of official services is required to cover all repairs Possible.
We can find these service providers authorized by Apple on the official website of the company, from this same link. The truth is that they are a fundamental piece for the company since they allow covering the repairs of any device in case of not having an Apple store near our house and these also require the help of the firm for these complicated times that we are living with the coronavirus crisis.