I have found similar topic, that confirm my assumption about using URL scheme to exchange data between apps:
Could you please confirm, that in real life this way is acceptable ?
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I was using the Credit Card Terminal app to grab the cc data and process it and then send it back to FMP Go with a URL scheme. But, now I am using Card Swipe which is a native iOS app developed by John Morina, a FileMaker Developer, to get the raw CC data, which we then use the URL scheme to bring data into our FM Go app KiPoint. We then use the web viewer to send the data to Authorize.net or other gateways to process the transaction. The whole process to get the cc approval takes about 3-5 secs.
We do sell our KiPoint app open, as other FM Developers can use it to customize their own POS solutions on iOS. You can check out our demo on our website at www.kibizsystems.com/kipoint.
Let me know if you have any further questions.