# Environment & Testing

- [Sandbox and production URLs](https://developers.bead.xyz/faqs-and-troubleshooting/environment-and-testing/sandbox-and-production-urls.md)
- [Test data: email address requirements](https://developers.bead.xyz/faqs-and-troubleshooting/environment-and-testing/test-data-email-address-requirements.md)
- [Crypto payments, environment and testing](https://developers.bead.xyz/faqs-and-troubleshooting/environment-and-testing/crypto-payments-environment-and-testing.md)
- [How to Prepare for USDC Testing](https://developers.bead.xyz/faqs-and-troubleshooting/environment-and-testing/how-to-prepare-for-usdc-testing.md)
- [USDC network fees and cost considerations](https://developers.bead.xyz/faqs-and-troubleshooting/environment-and-testing/usdc-network-fees-and-cost-considerations.md)
- [How to Test Klarna Payments](https://developers.bead.xyz/faqs-and-troubleshooting/environment-and-testing/how-to-test-klarna-payments.md)
- [Why do Sandbox payments over $100 return “payment amount exceeds the terminal’s maximum limit”?](https://developers.bead.xyz/faqs-and-troubleshooting/environment-and-testing/why-do-sandbox-payments-over-usd100-return-payment-amount-exceeds-the-terminals-maximum-limit.md)


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