Heroku provides a free tier for dynos and for the Postgres add-on, so you will be fine as long as you stay on the free plan (which takes effort to upgrade, so no need to worry about surprise charges). Credit Card details are used a bit for verification/validation and in the case that you upgrade your plans.
Heroku needs to be able to reliably identify and contact our users in the event of an issue. We have found that having a credit card on file provides the most reliable way of obtaining verified contact information. Account verification also helps us prevent abuse.
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Heroku为Dynos和Postgres附加组件提供了免费的层，因此，只要您留下免费计划（需要努力升级，因此您就不必担心出人意料的费用）。信用卡详细信息用于验证/验证，并且在您升级计划的情况下。
per heroku的文档
Heroku provides a free tier for dynos and for the Postgres add-on, so you will be fine as long as you stay on the free plan (which takes effort to upgrade, so no need to worry about surprise charges). Credit Card details are used a bit for verification/validation and in the case that you upgrade your plans.
Per Heroku's documentation