Client error: `GET https://www.mailjet.com/fr/wp-json/wp/v2/blog//%22https:////stackoverflow.com//questions//70597523//how-to-send-an-email-with-variables-using-mailjet-api-v3-1/%22` resulted in a `404 Not Found` response:
{"code":"rest_no_route","message":"Aucune route correspondante \u00e0 l\u2019URL et \u00e0 la m\u00e9thode de requ\u00ea (truncated...)