403 Error when adding contacts to sendgrid

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I'm using then Sendgrid's account trial and used API key that has full access. I also referred to this documentation doc enter image description here

This is always the results

enter image description here

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blackieer On

I found it.

You should use Guzzle and this API: https://sendgrid.api-docs.io/v3.0/contacts/add-or-update-a-contact.