DESCRIPTION
This endpoint checks if an invoice number exists in the system already.
URL STRUCTURE
https://[hostname]/invoice/check-invoice-number-exists/{invoiceNumber}
METHOD
GET
HEADERS
**Authorization:** string Base64 [email]:[key]
ARGUMENTS
| Name | Type | Description |
|---|---|---|
| invoiceNumber | string | Invoice number |
RETURNS
"true" or "false"