# TIPS

- [Tax exemption on payments](https://portone.gitbook.io/docs-en/tips/tax.md): Learn how to set the tax-free amount when requesting a payment.
- [Service launch checklist](https://portone.gitbook.io/docs-en/tips/chk.md): Use this checklist to self-diagnose your payment service before launch.
- [Confirm Process](https://portone.gitbook.io/docs-en/tips/confirm-process.md): A service that passes the control of the payment request to the merchant server.
- [i'mport payment flow](https://portone.gitbook.io/docs-en/tips/flow.md): Compare the payment flow between direct integration with a PG vs. through i'mport.
- [Agency & Tier](https://portone.gitbook.io/docs-en/tips/agency-and-tier.md): Learn how to set up a main merchant and its sub-merchants.
- [Billing key issuance by PG](https://portone.gitbook.io/docs-en/tips/billing-key-issuance-by-pg.md)
- [Bank codes by PG](https://portone.gitbook.io/docs-en/tips/bank-codes-by-pg.md)
- [PG codes](https://portone.gitbook.io/docs-en/tips/pg-codes.md): JavaScript SDK PG codes
- [Courier codes](https://portone.gitbook.io/docs-en/tips/code.md): Courier codes required for escrow delivery registration.
- [What is redirection?](https://portone.gitbook.io/docs-en/tips/redirect.md): Learn about page redirection.
- [PG error codes](https://portone.gitbook.io/docs-en/tips/pg-error-codes.md): Download error codes that are returned by each PG.


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