we are looking for some ways to differentiate what are all the standard fields and what are all the custom fields in their metadata API?
Is there any API to fetch just the list of custom fields?
Custom vs standard fields
The only way to differentiate between system fields and custom fields is to look at the “type” property, once you have seen the type of all the default system fields you can make a note of them and ignore them in your code, you could also combine that with the “removable” property, system fields are not removable so this will always be false for system fields (but it’s also false for some fields installed by apps, such as the linked ticket app)
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