The endpoint "v2/customerinvoicedrafts/{customerInvoiceDraftId}/convert" unfortunately does not support sending invoices as an Autoinvoice.
A workaround to this is to do the following:
Make sure the invoice is still a draft.
Create "customerinvoicedraft" > add an attachment using "salesdocumentattachment" endpoint > convert the draft to an invoice using the "customerinvoice" endpoint with the properties "CreatedFromDraftId" and "sendtype".
Please see below example on what it can look like:
{ "CustomerId": "2bab59cd-0e03-407e-bb59-9a1d1ca9bb02", "IsCreditInvoice": false, "RotReducedInvoicingType": 0, "RotReducedInvoicingPropertyName": null, "RotReducedInvoicingAmount": 0, "RotReducedInvoicingAutomaticDistribution": false, "Rows": [ { "LineNumber": 0, "ArticleId": "991d82e9-fdf6-4f4c-884b-517c2fa67adf", "Text": "Lemon | 29,75 kr/kg", "UnitPrice": 3.57, "DiscountPercentage": 0, "Quantity": 1 }, { "LineNumber": 1, "ArticleId": "991d82e9-fdf6-4f4c-884b-517c2fa67adf", "Text": "Delivery org", "UnitPrice": 22, "DiscountPercentage": 0, "Quantity": 1 } ], "YourReference": null, "OurReference": "", "EuThirdParty": false, "InvoiceDate": "2019-03-07", "DeliveryDate": "2019-03-07", "TermsOfPaymentId": "0f7c3ab0-0c02-46fe-b291-d8cd5ab445f7", "CreatedFromDraftId": "aa2902a2-118f-4505-b22e-ef38fc570dbe", "SendType": 2 }
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