Need Credit Card Before Trialling Premium Features

Objective:
Raise the odds of users trying your product without the friction of a credit card but require that information if they show intent to try premium features.

Details:
At LucidChart, they tested requiring credit card information before providing a trial of premium features.
The free version still available without needing it

After 4 months of testing, they saw a significant boost in payments with very little negative impact on engagement. Interestingly, payment quality also increased with this change.

Source:
https://growthhackers.com/questions/should-i-ask-for-credit-cards-during-the-registration-process#comment-60553