Function createPaymentIntent

createPaymentIntent(
    amount: number,
    currency: string,
    description: string,
    surveyCount: number,
    userId: number,
): Promise<string>
Creates a payment intent with Stripe
Parameters
- amount: number
  Amount in cents
- currency: string
  Currency code (e.g., 'eur')
- description: string
  Description of the payment
- surveyCount: number
  Number of surveys that will be added to the user's quota
- userId: number
  ID of the user making the payment
Returns Promise<string>
The client secret for the payment intent
Throws
Error if payment creation fails
Example
```
const payment = await createPaymentIntent(1000, 'eur', 'Pack 50 enquêtes', 50, 1);
```
- Defined in app/backend/src/services/stripe-service.ts:45