Integral fridge door

It depends on the type of integrated fridge. If it's a sliding hinge system, the plastic sliding brackets may have come loose or are missing. If it's a fixed hinge system, the mounting brackets may have pulled away from the cabinet door. Either way, it's usually a straightforward repair unless parts have been lost or broken. A couple of clear photos of the fridge door and hinges would make it much easier to identify what's missing.