Convertr uses OAuth for it's API authentication. All end points (unless explicitly detailed) require an access_token to be passed through with each request. Tokens expire after 60minutes and need to either be refreshed or a new one generated.
Access Token
POST /oauth/v2/token HTTP/1.1 Host: dev.cvtr.io Content-Type: application/x-www-form-urlencoded Cache-Control: no-cache Postman-Token: 255fe433-ff32-4f00-9b4e-dd79a3ceae13 client_id=4_50bb9wpfmj8cwgw8kk8s848ck8s0gkc8wok0wogockwck488o8& client_secret=zfiacn1uttcsogc0w4wocowgkk0socsggkoo88k8kskws8gc& username=danny%40convertrmedia.net& password=!LoveC0nvertr& grant_type=password