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The QB Online API states that the Invoice object contains a CustomField array of objects. However when querying an invoice, that field is not returned. Is there a way to get this information?

I haven't tried adding this info when creating an invoice but I assume it would be the same as adding Line items?

Indeed QuickBooks returns custom fields as JSON. But we return custom fields as separate fields. For example we have created three custom fields: Custom_field, Custom_field2 and Custom_field3. http://prntscr.com/l3ld2g

dotConnect for QuickBooks will return 3 additional fields in this case: SalesCustom1_Custom_field, SalesCustom2_Custom_field2 and SalesCustom3_Custom_field3.

This significantly eases working with these fields in comparison to working with JSON.