[Python] Square API for invoice attachments 'Received multiple request parts. Please only...

The new square api versions 42+ have breaking changes. Im trying to upgrade to ver v42, and I am testing in a local dev environment.

I keep getting the following error: *** square.core.api_error.ApiError: status_code: 400, body: {'errors': [{'category': 'INVALID_REQUEST_ERROR', 'code': 'INVALID_CONTENT_TYPE', 'detail': 'Received multiple request parts. Please only supply zero or one `parts` of type application/json.'}]}

when I try to upload an approx ~800 byte jpeg [very grainy] in the development sandbox for Square Invoice API using the following code:

pdf_filepath = 'local/path/to/file.jpg'
idem_key = 'some-unique_key_like_square_invoice_id'
f_stream = open(pdf_filepath, "rb")
try:
# I have tried using a stream as well, still the same error
invoice_pdf = SQUARE_CLIENT.invoices.create_invoice_attachment(
invoice_id=square_original_invoice.id,
# this also does not work
# image_file=f_stream,
image_file=pdf_filepath,
request={
"description": f"Invoice-{pdf_filepath}",
"idempotency_key": idem_key,
},
)
except ApiError as e:
print(f"ERROR _attach_pdf_to_vendor_payment with errors {e}")


In the online sandbox API, I get the 400 Response error:

// cache-control: no-cache
// content-type: application/json
// date: Wed, 30 Apr 2025 13:35:06 GMT
// square-version: 2025-04-16

{
"errors": [
{
"code": "BAD_REQUEST",
"detail": "Total size of all attachments exceeds Sandbox limit: 1000 bytes",
"category": "INVALID_REQUEST_ERROR"
}
]
}


This worked fine in the old pre 42 API, with minor syntax change, and I know the limit is now imposed to have a 1000 byte limit for the attachment, but why can't I upload attachments in the sandbox now?

Related Docs https://developer.squareup.com/docs/invoices-api/attachments

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