Allow developer to set a custom refill time when using the refill interval feature

[perkinsjr]

Preliminary Checks

• I have reviewed https://unkey.com/docs for existing features that would solve my problem

• I have searched for existing feature requests: https://github.com/unkeyed/unkey/issues

• This issue is not a question, general help request, or anything other than a feature request directly related to Unkey. Please ask questions in our Discord community: https://unkey.com/discord.

Is your feature request related to a problem? Please describe.

If a user want to set a custom date to refill for example:

User signs up for our customers product on the 15th of the month > Refill date should be the 15th of the month

Currently the flow goes:

User signs up for our customers product on the 15th of the month > Refill date is 1st of the month

Describe the solution

Provide the ability to set the day of the month for the refill to begin.

• Add DB column to add day of month
• Add additional field to provide day of month to the API
• Update UI to also handle this
• Update how we fire the refill.

Describe alternatives you have considered (if any)

No response

Additional context

No response

[linear]

ENG-1324 Allow developer to set a custom refill time when using the refill interval feature