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Payment policy

Effective from October 15, 2026Last updated October 16, 2026

On this page
  1. 1. Prepaid plans that never renew
  2. 2. Prices
  3. 3. Who can buy, and for which organization
  4. 4. Buying more and changing plans mid-term
  5. 5. Trial and verification bonus
  6. 6. Payment methods
  7. 7. Expiry reminders
  8. 8. Invoices
  9. 9. Payment security
  10. 10. Failed transactions and refunds
  11. 11. Contact

This policy sets out how paid plans of CTAS products (currently CTAS Work), provided by CTA Solution Co., Ltd., are bought and paid for. It applies from 15 October 2026.

1. Prepaid plans that never renew

  • CTAS Work plans are prepaid for a fixed term: each purchase is a single payment that adds a period of use to the organization. No plan renews or charges you automatically, whichever channel you buy through.
  • A plan belongs to the organization, not to the person who paid. If the buyer leaves the organization, the time already bought stays with the organization, and nobody is charged again.
  • Terms on sale:
    • Starter, Growth and Business: 3 months (91 days), 6 months (182 days), 12 months (365 days).
    • Add-ons (extensions and storage): 6 months (182 days), 12 months (365 days).
    • Enterprise: per contract.
  • Terms are counted in the fixed numbers of days above, regardless of month length.

2. Prices

  • Prices are published on the Pricing page and shown at the time of purchase, in Vietnamese dong (VND), per organization (not per person). Value-added tax, if any, is shown at checkout or in the contract.
  • Longer terms cost less per month.
  • Buying on the web (business.ctas.vn, work.ctas.vn) costs less than buying in the app. In-app prices on iOS and Android are shown by the App Store and Google Play and are what you pay when buying through those stores.
  • Prices may change from time to time. A price change does not affect time you have already bought.

3. Who can buy, and for which organization

  • An organization's administrators can buy plans for it, on a phone or on the web. Someone who administers several organizations can buy for each of them; each purchase adds time only to the organization selected when buying.
  • If several administrators buy for the same organization, the time is appended under the rules in section 4 — two plans never run side by side and nobody is charged twice for the same period.
  • The purchase history (date, plan, term, amount, channel, buyer, status) is shown to administrators under Organization › Current plan in the app and on the web.

4. Buying more and changing plans mid-term

  • Buying the same plan again (renewing): the new time is added to the end of the time already bought.
  • Moving down to a lower plan: the current plan runs to the end of the time already bought, then the lower plan starts. Once a move down is scheduled, the organization can only buy more of that lower plan, or upgrade.
  • Moving up to a higher plan: takes effect as soon as payment is confirmed. The time left on lower plans is converted into days of the higher plan and added to the new purchase:
    • the time left is valued at the lowest daily price of the lower plan;
    • the days received are counted at the highest daily price of the higher plan, rounded down;
    • the daily prices used for conversion are the in-app prices divided by the number of days in each term.
    For example, 120 days left on Starter become 32 days of Growth. Converting is always worth less than buying the higher plan outright, so if you expect to stay on a higher plan, choose it from the start.
  • Administrators can also upgrade with the time left without buying more: the time is converted as above and nothing is charged.
  • Before you pay, the purchase screen always shows when the plan will start, when it will run until and how many days are converted, if any.
  • Storage add-ons change size under the same rules (1 GB < 5 GB < 10 GB). Feature add-ons are extended by buying them again.

5. Trial and verification bonus

  • Every new organization gets a 7-day trial of Growth, with no payment required. A plan bought during the trial starts as soon as it is paid for.
  • Each account can create up to 2 organizations (joining other organizations is unlimited). Businesses with several legal entities can contact CTAS to raise this limit.
  • An organization whose business verification CTAS has approved receives 30 extra days, once: added to the first plan bought after approval, or straight away if a paid plan is already running when it is approved.

6. Payment methods

6.1. In the iOS and iPadOS app (App Store)

  • A single payment with the method linked to your Apple ID. Apple processes the transaction and sends the receipt.
  • The purchase does not renew; there is nothing to cancel afterwards.

6.2. In the Android app (Google Play)

  • A single payment with the method linked to your Google account. Google processes the transaction and sends the receipt.
  • A pending payment (for example, cash at a store) is recorded only once Google confirms it has been paid.

6.3. On the web

  • At business.ctas.vn or work.ctas.vn, an administrator chooses the plan and term, then pays from the organization's CTAS wallet balance or through the PayOS payment gateway (bank transfer by VietQR code or other methods PayOS supports).
  • Time is added automatically as soon as the wallet is debited or the gateway confirms the payment.

6.4. Bank transfer under a contract

Business customers on a contract (Enterprise) pay by bank transfer to:

  • Account holder: CTA Solution Co., Ltd. (Công ty TNHH CTA Solution)
  • Account number: 1903 677 372 3015
  • Bank: Vietnam Technological and Commercial Joint Stock Bank (Techcombank) — Nguyen Oanh branch
  • Transfer reference: the contract number or payment code CTAS provides.

CTA Solution never asks for payment into a personal account. If you receive such a request, please tell us immediately.

7. Expiry reminders

  • CTAS emails a reminder 30, 15, 7 and 1 days before all the time bought runs out, to the latest buyer (if they are still active in the organization) and to the organization's email. Administrators also see a reminder in the app at 30, 15 and 7 days.
  • When the time bought runs out, the organization becomes read-only: its data is kept and can be viewed and exported, but nothing can be added or changed until a new plan is bought.

8. Invoices

  • For web and contract payments, CTA Solution issues an electronic VAT invoice as required by law. Please provide your company name, tax code, address and invoice email when paying, or send them to support@ctasolution.vn within the month of the transaction.
  • For App Store and Google Play purchases, Apple or Google is the seller and provides your receipt.
  • After every successful purchase, CTAS emails a receipt to the buyer and to the organization's email.

9. Payment security

CTA Solution does not collect or store your card number, card security code or online banking credentials. Transactions are processed by Apple, Google or the PayOS gateway under their own security standards. We receive only what is needed to confirm a transaction: the transaction ID, product, amount, time and status.

10. Failed transactions and refunds

  • If you were charged but the time has not been added after 30 minutes, please try Restore App Store purchases or Restore Google Play purchases in the app or contact us with the transaction ID; we will check and add the time, or return any amount charged in error, under section 5 of the Cancellation & refund policy.
  • Duplicate charges or wrong amounts are refunded for the part charged in error.
  • Apart from the payment errors above, purchased plans are not refunded. If Apple or Google refunds a transaction under their own policy, the time from that purchase is removed from the organization.

11. Contact

Email: support@ctasolution.vn · Hotline: 0931 102 398 (Monday – Friday, 8:30 – 17:30)