Create a new member on the parent profile.

Owner of the member profile: data.userUuid is optional. When supplied it
identifies the existing user who will own the member profile; under campaign API
key authentication (Authorization header, Bearer raisely-sk-...) with the
explicit-user rollout enabled, the user must belong to the same organisation as
the campaign — a userUuid from another organisation returns 404 not found. When
data.userUuid is omitted, the member defaults to the authenticated user (for a
campaign API key that is the key owner).

For custom components:

RaiselyComponents.api.one('profiles', '{path}').all('members').post(data = {}, params = {}, headers = {}) => Promise<{result}>

See Restie Response Data for a more detailed overview of responses through the client wrapper