call REST API and String Split

Hi all. i want to convert data to json and import string value through API. and the purpose is to display the corresoinding HEX value by changning it to decimal. so we installed the “Community commons Library” app to split json data.(string split) but I don’t know how to proceed. i wonder if mapping and microflow are correct and how to type in split string   attached are the data formats and photos. i’d like to bring just one byte of data that corresponds to the ID ( conversion to Decimal in advance to json) and display it.   please help and teach me,,,,please
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