---
title: Billing & payments
description: Payment channels, top-ups, invoices, promotions and resource quotas.
url: https://nexcmp.com/docs/billing/
---

# Billing & payments

Payment channels, top-ups, invoices, promotions and resource quotas.

- [Payment channels](https://nexcmp.com/docs/billing/payment-channels/) — How customers top up their wallet in NexCMP — the available channels, how to enable each one, fees, limits and how to watch them.
- [Stripe](https://nexcmp.com/docs/billing/stripe/) — Connect Stripe to NexCMP for card payments, Apple Pay, Google Pay, Link and Alipay — API keys, webhook, domain registration and a test payment.
- [PayPal](https://nexcmp.com/docs/billing/paypal/) — Connect PayPal to NexCMP for wallet top-ups — REST app credentials, webhook, sandbox testing and saved PayPal accounts.
- [USDT (Binance)](https://nexcmp.com/docs/billing/usdt/) — Accept USDT wallet top-ups by watching a Binance deposit address — read-only API key, network choice, address verification and unmatched deposits.
- [Bank transfer (Vietnam)](https://nexcmp.com/docs/billing/bank-transfer-vn/) — Accept Vietnamese bank transfers (VND) with Sepay — receiving account, memo prefix, webhook, limits, and how to assign unmatched transfers.
- [Minimum top-up](https://nexcmp.com/docs/billing/minimum-top-up/) — Set the smallest and largest wallet top-up per payment, and understand the other balance floors that decide whether a customer can order.
- [Saved payment methods](https://nexcmp.com/docs/billing/saved-payment-methods/) — How customers save a card, a Stripe wallet or a PayPal account for automatic top-up, how to remove them, and what NexCMP stores.
- [Auto top-up](https://nexcmp.com/docs/billing/auto-top-up/) — Keep customer wallets funded automatically from a saved card or PayPal account — usage-based and fixed modes, global limits and failure handling.
- [Invoices and ledger](https://nexcmp.com/docs/billing/invoices-and-ledger/) — Where money is recorded in NexCMP — the wallet ledger, invoices, top-up payments, refunds and payouts, vouchers and revenue reports.
- [Promotions](https://nexcmp.com/docs/billing/promotions/) — Issue top-up codes: wallet bonuses, service-only credit and percentage discounts with a cap and a minimum order — create, distribute and track them.
- [Quotas](https://nexcmp.com/docs/billing/quotas/) — Limit what a new customer can create until they have funded their wallet — VM resource tiers, VM count and per-service quotas, with per-customer overrides.