> For the complete documentation index, see [llms.txt](https://docs.galaxypay.vn/upc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment.md).

# PAYMENT

- [Pay](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/pay.md): Use to create a simple payment request. Use for Merchant checkout and Merchant Hosted checkout.
- [Pay with create token](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/pay-with-create-token.md)
- [Pay with token](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/pay-with-token.md)
- [Pay with Option](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/pay-with-option.md): Use to create a payment request with payment options, then customer can select the payment methods at GALAXY PAY
- [Pay with QR](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/pay-with-qr.md): Use to create a dynamic QR payment request, then customer can scan the QR code and process the payment on any banking mobile applications.
- [Checkout(for modal checkout)](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/checkout-for-modal-checkout.md): Use to create a simple pre-order payment request
- [Payment Link](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/payment-link.md): Use to create a dynamic payment link.
- [Fast pay](https://docs.galaxypay.vn/upc/payment-gateway/api-specification/payment/fast-pay.md)