我必须'翻译'这个卷曲请求:
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
进入PHP curl请求。问题是文件,我在php curl请求中找不到如何做到这一点。你能帮帮我吗?