During your sync operation, you receive an error showing, Unexpected character encountered while parsing value on target application, which is Shopify here.

Cause

There might be a number of reasons for this error:

• Invalid Character in some attributes
• Data type mismatch

Resolution

The resolution is given below:

• For Invalid Character in some attributes, Check the logfiles in the snapshot and if the mapping is erroneous, you can add some functions which will help to replace/trim these characters.

These are the the list of function which can be used:

[genericlib:TrimAllCharacters(data,characters)]
[genericlib:RegexReplace(data,regex,replaceString)]
[genericlib:ReplaceAllCharacters(data,characters,replacechar)]

Check here on How to do Attribute Mapping in AEC

• For Data type mismatch use concat (#attributevalue) run resync or do the data sync.

Check here on  How to Use Action filter to check data type mismatch