Guidance needed with OAuth and API / PHP SDK to Update Custom Field

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@Andron_Ocean, someone helped Maria out with this, and has been answered in this post below.

Can you update custom fields with API in the same code used to "Post" to HTTPS in automation

I have set up an automation that contains a landing page form that collects customer profile data using basic and custom form fields. As part of this automation, I have created a “Send to HTTP Post” that takes this data, creates a RefCode, and submits it to a database table outside of Keap. Once completed, it sends me an email with the submitted data and the RefCode. I am wondering if it is possible that while I have all this data in variables (more specifically, the email, vehicle id, and Re…