Documentation Index
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subscribers.writemerchant_id and email to be specified, but
accepts additional subscriber information.
This endpoint responds with a 201 for any valid email address that is sent,
even if the email address is already captured in the system. To avoid
unintentional PII exposure for existing records in the system, this API responds
only with accepted email address. The only time this endpoint 400s is when the
input email address is invalid.