All requests to the BoldSign API must be made over HTTPS with TLS 1.2 or higher for security reasons.
We recommend using the JSON body format when performing API requests. In order to make a proper JSON-formatted request, make sure you provide Content-Type: application/json in HTTP request headers. Our API supports UTF-8 for character encoding.
For the send document or template method, the regular form-encoded body format is also supported.