Adds one or more members to the borrowing entity of a loan that
already exists.
Adding is its own request because memberId is required on
PATCH /api/v4/loans/{id} — an entry there has to name the stored
member it updates, so no shape there means "add". Each route does one
job: PATCH updates the members you name, and this route adds new
ones. Properties are split the same way, with
POST /api/v4/loans/{id}/properties.
Do not send memberId here. The platform assigns it, so sending one
is refused. Send only the member's own fields — anything belonging to
the loan, or to the entity itself, is refused rather than quietly
ignored.
A success is 201, and you get back the members this call created and
nothing else — a list, in the order you sent them, each carrying the
memberId the platform assigned. Send two members and you get two
entries; send one and you get a list of one, so there is no need to
check the count before reading the reply. The entity's other members are
not included; read those with GET /api/v4/loans/{id}.
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