I had a quick look at the API documentation and as far as I could see there unfortunately seems to be no way to retrieve user custom fields via any API as of yet. However, since the APIv2 is marked as deprecated I strongly suggest to accommodate for the usage of APIv3 now, because I think it is very unlikely that this feature will be added to the APIv2.
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Hello there,
I had a quick look at the API documentation and as far as I could see there unfortunately seems to be no way to retrieve user custom fields via any API as of yet. However, since the APIv2 is marked as deprecated I strongly suggest to accommodate for the usage of APIv3 now, because I think it is very unlikely that this feature will be added to the APIv2.
Regards,
Alex