AI credits (shown as tokens in the app) are used whenever you generate a Pin image with AI. Every plan includes a monthly allowance — see the Pricing page for current amounts. You can check your balance and usage anytime in Settings → Billing.
What you can try
Check your current balance and usage in Settings → Billing.
See the Pricing page for how many credits each plan includes.
Upgrade your plan from the Pricing page if you need more credits.
Credits are only used when an image is actually generated, so failed generations shouldn't normally cost credits.
If you were charged credits but didn't get a result, contact support.