Each campaign has different costs, here is a list of costs for each campaign:
Views : 6 to 30 Credits / Action
Likes : 20 Credits / Action
Subscribers : 30 Credits / Action
Credits will be deducted and paid to other members who have successfully taken action for your campaign.
If your credit amount is not sufficient, the campaign will not work and will run again if you have credit.
Credit is free, this link will teach you how to get unlimited credit https://blog.viewgrip.net/knowledge/exchange/