YumiSign comes with a complete REST API, allowing you to interconnect your project easily. Please read the documentation here:
https://docs.yumisign.com/index.html
In order to use the API, you will need an API key. You can generate one directly from your YumiSign account, in the developer section.
We also provide a Javascript SDK to ease your integration experience. More SDK in other popular languages are being developed and will be available soon.