I must 'translate' this curl request :
curl
-X POST
-H "Authorization: Bearer YOUR_ACCESS_TOKEN"
-F "recipients[0][name]=John"
-F "recipients[0][email]=john.doe@gmail.com"
-F "files[0]=@/path/to/the/pdf/document.pdf"
https://api.sandbox.signaturit.com/v3/signatures.json
Into a PHP curl request. The problem is the file, I don't find how to do that in php curl request. Can you help me please ?