> For the complete documentation index, see [llms.txt](https://loop-crypto.gitbook.io/old-loop-crypto/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components.md).

# Core components

- [Collecting authorization](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components/collecting-authorization.md)
- [Enabling payment on multiple networks](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components/collecting-authorization/enabling-payment-on-multiple-networks.md)
- [Accepting ETH and MATIC](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components/collecting-authorization/accepting-eth-and-matic.md)
- [Sending payment requests](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components/sending-payment-requests.md)
- [Checking a customer's balance & allowance](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components/checking-a-customers-balance-and-allowance.md)
- [Receipts and reminders](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components/receipts-and-reminders.md)
- [Customer portal](https://loop-crypto.gitbook.io/old-loop-crypto/learn/core-components/customer-portal.md): https://my.loopcrypto.xyz/login