How to add a custrom Field to a Lead

API
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2

Hey,

I think you are mixing 2 concepts here:

To add a brand new custom field to leads, you do indeed use POST /api/v1/dealFields to add it as deals and leads share their custom fields.

To add a value to a specific custom field of a lead, you can use POST /api/v1/leads or PATCH /api/v1/leads/:uuid, e.g.

{
    "8f778459bfd0552cecfbcaa894ee30a82ac001eb": "my custom field value"
}