ruby on rails - heroku free tier add worker -

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i'm using heroku's free tier , trying set worker process delayed_jobs. according docs have access worker. can run worker process running heroku run rake jobs:work, 1 off process. i've looked @ heroku's delayed jobs docs , when trying run heroku ps:scale worker=1 following message 

scaling dynos... failed !    please verify account in order change resources (please enter credit card) more information, see https://devcenter.heroku.com/categories/billing verify @ https://heroku.com/verify

how can scale worker dyno free plan? need enter in credit card?

from heroku docs

credit card information not required free apps without add-ons. becomes requirement once wish own more 5 apps @ time, or use add-ons other postgresql:dev or pgbackups:plus –– if add-ons free.

it's scaling app add worker considered add-on, therefore required validate account.


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