Boards the merchant onto an acquirer synchronously and returns the resulting connection with 201. There is no pending state.

You name an acquirer (your bank relationship) and the acquirer-assigned merchant_id (MID), plus the terminal_id (TID) when the acquirer needs one. Fat Zebra validates the MID/TID and currencies against its config and boards the merchant onto every processor behind that acquirer that can carry a requested currency — you never name a processor. Omit currencies to board everything the acquirer supports.

Boarding is idempotent: re-posting the same acquirer returns the existing connection rather than creating a duplicate.

Failures are reported inline:

• 422 validation_error — an unsupported currency, a missing merchant_id, or no processor supports the acquirer for the requested currencies. The offending fields are listed under error.fields.
• 422 processor_error — an underlying processor board was rejected or errored upstream.
• 404 not_found — the acquirer is unknown or not available to this partner.

{
  "acquirer": "nab",
  "merchant_id": "MID0012345",
  "terminal_id": "12345678",
  "currencies": [
    "AUD"
  ]
}