Please refer to the following sample, it must be build using cross-platform tool, so that you only need to code once. The portal must have a easy to use admin dashboard, so that I can create account for clients who want to use the POS system.
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Hi There, Hope you doing good. We are much expertise group of iOS, Android, Website developers and Designers. We will develop your POS with apps as you need. Let’s discuss in detail then will start work on it. Thanks.