The QR Invoice REST API provides various services for creation and processing of Swiss QR Invoices. This API is available as a Cloud Service but is also available as a self-hosted solution.
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https://rest.qr-invoice.cloud/
https://rest.qr-invoice.cloud/v2/pdf/merge
curl -i -X POST \
'https://rest.qr-invoice.cloud/v2/pdf/merge?onPage=1' \
-H 'Content-Type: multipart/form-data' \
-H 'X-API-Key: YOUR_API_KEY_HERE' \
-F file=string \
-F file2=string
https://rest.qr-invoice.cloud/v2/pdf/append
curl -i -X POST \
https://rest.qr-invoice.cloud/v2/pdf/append \
-H 'Content-Type: multipart/form-data' \
-H 'X-API-Key: YOUR_API_KEY_HERE' \
-F file=string \
-F file2=string