sendgrid not working with google app engine

[Brandon Zukowski]

Hi there I followed the integration steps to send out emails using sendgrid with App engine, I was wondering if you have to specify anything within your app.yaml environment, because when i try to send a JSON response to the sendgrid servers, it never makes it there since no response is returned, and I followed the integration exactly, my application is in PHP

[Olu]

As explained in this SendGrid documentation[1] there are ways to send email through SendGrid. I assume you are using the Web API, which requires authentication for each API call[2]. As explained in this documentation[3], these third party services use API keys to authenticate your app and you have to add the key to the environment variables section in your app's App.yaml file. This is a GitHub link[4] showing a Sample App.yaml file for an Application in App Engine Flex environment using SendGrid. 

[1]https://sendgrid.com/blog/5-best-practices-for-using-sendgrid-with-google-app-engine/

[2]https://sendgrid.com/docs/API_Reference/Web_API/using_the_web_api.html#-Authentication

[3]https://cloud.google.com/appengine/docs/flexible/php/sending-messages?hl=ru#adding_client_libraries_and_third-party_api_keys_to_your_app

[4]https://github.com/GoogleCloudPlatform/php-docs-samples/blob/master/appengine/flexible/sendgrid/app.yaml