square.createInvoiceAttachment uploads a file and attaches it to an invoice.
Example
automations/square-create-invoice-attachment.automation.ts
Inputs
Every input accepts a compatible signal. It requiresINVOICES_WRITE.
Use the official CreateInvoiceAttachment reference for provider field semantics and limits.
Output
Returns the officialSquare.CreateInvoiceAttachmentResponse response as a codec-safe object. Square integer money amounts remain bigint values.