There was no option on the billing page to insert the 100 School discount code
Can you clarify where did you get this discount code from? Thank you. Can you also share the terms/the pricing plan it applies to?
The discount code was provided in one of the courses from an online AI training program - 100 School . The course topic was “build an audio to text note taking app”. Glide was presented as the platform to use to build this app. The course directions included this message:
Welcome & FAQs
Glide has helpfully put together this welcome and FAQ page for our students so that you can get the most from its platform.
IMPORTANT:police_car_light:
Today’s lesson requires you to sign up for Glide’s “Explorer” plan. Glide is giving you one month free of this plan. Just enter Code Redacted during the account upgrade process for $25 off the Explorer plan (equivalent to a one month free trial). Please note, a valid credit or debit card is required to complete this transaction. Cancel this plan within the first 30 days of upgrading, and you won’t be charged for any additional months.
Time to Cook 
Create your account with Glide.
Follow these instructions (section 1) to claim your free month of Glide’s Explorer plan.
Follow this step-by-step guide or video to create your audio-to-text note-taking app.