SMS verifications free tier limit

[r00dgirl]

why

today, verified sms has a free tier limit of 10k responses per form. product ops (POPS) enforces this free tier by manually checking twice a month to see if any form has crossed the 5k mark and emailing form admins to give them a heads up.

given currently heavy workload on POPS and the increasing number of forms that fall in this category, it is worth automating this to free up POPS to focus on other pressing matters.

what we want to do

1. on-enable modal

update this modal to make free tier limit and behaviour clear

header: OTP verification will be disabled at 10K responses

We provide 10,000 free SMS OTP verifications per account, only counting owned forms. Once this limit is reached, SMS OTP verification will be automatically disabled for all owned forms. If you are a collaborator, ensure the form's owner has enough free verifications. If you require more than 10K verifications, please arrange advance billing with us.

(smaller text) Free verifications used: (insert count)/10,000

change button to our red button with text 'Accept'

2. warning emails

send email at response count = 2.5k, 5k and 7.5k marks to remind form admin to prepare twilio switch.

3. disable sms verifications on owned forms

at account level 10k free verifications sent

4. update verified SMS enabling behaviour

when admin tries to enable verified SMS, check if form owner's account has 10k free verifications.

(a) if so show an error message.

Error: Form owner has reached free tier limit for SMS verification. To continue using SMS verification, please arrange billing.

(b) if not, show the default modal in #1.

4. disable notification

send an email to notify admins when SMS verification disabled for an account/form.

[r00dgirl]

before launch

• change modal button to blue that says I understand (addressed by feat(sms-limiting): ui changes for modal #2541)
• add one-liner quota (addressed by feat(sms-limiting): ui changes for modal #2541)
• warning & disable emails for admins (addressed by feat(sms-limiting): disabled email #2532)
• disable emails for collaborators (addressed by feat(sms-limiting): disabled email #2532)

can do after launch

• warning emails for collaborators (feat(sms-limiting): changes for mail/modal #2565)
• do not show one-liner quota for onboarded forms (fix(sms-limiting): hide counts when forms are onboarded #2585 )
• wording changes for copy (feat(sms-limiting): changes for mail/modal #2565)
• log email sends, log disables (feat(sms-limiting): changes for mail/modal #2565)
• Fix generate OTP issue  #2531 (fix(verification): prevents otp request when limit exceeded #2586)

[pearlyong]

mock for one-liner displaying number of free SMSes used