Feature Request: Send currencyCode for the Contact when creating Invoices

[itscharliecowan]

We're creating invoices for clients with varying default currencies (e.g., EUR). The MCP create-invoice tool doesn't pass currencyCode to the Xero API, so invoices default to the organisation's base currency (GBP) rather than the contact's currency.

Current behavior:

Contact is set up with default currency EUR
Invoice created via MCP defaults to GBP

Proposed solution:

Either:

Add currencyCode as an optional parameter to the tool schema
Have the tool look up the contact's DefaultCurrency and pass it automatically

const CreateInvoiceTool = CreateXeroTool(
  "create-invoice",
  "Create an invoice in Xero...",
  {
    contactId: z.string().describe("The ID of the contact..."),
    currencyCode: z.string().describe("Currency code (e.g., EUR, USD). If not specified, could default to contact's currency.").optional(),  // <-- suggested addition
    lineItems: z.array(lineItemSchema),
    type: z.enum(["ACCREC", "ACCPAY"])...,
    // ...
  },

Question: Should the MCP pass this explicitly, or should the Xero API inherit the contact's default currency when CurrencyCode is omitted?

Thanks for a great MCP - loving the progress!