Then I would recommend you to contact this company for ios app development services
https://owlab.group/services/ios-app-development. They have been developing mobile apps for quite a long time, so there is a lot of experience in development. Look at their portfolio, they have a huge number of completed projects of different complexity. All the TOR you will develop together with the team leader, who will then supervise everything. There will be no problems with the security of your application. The development team uses the latest technology in development.