Card Declined by OpenAI/Anthropic? Move to TWD Billing

Why Overseas Card Payments Often Fail

Taiwan companies that pay OpenAI, Anthropic, or similar overseas providers by credit card sometimes run into a payment blocked by the bank's risk controls, or an account temporarily frozen because of an unusual charge pattern. The cause is usually the combination of overseas, foreign-currency, subscription-style charges. It is not necessarily the fault of any one bank, and it is not necessarily something the user did wrong. The trouble is that this often happens at the worst possible moment: a project is running, the API suddenly stops working, and only then do you discover the payment side has a problem.

Rather than dealing with it ad hoc every time it gets stuck, it is better to change the billing source to a local Taiwan provider that bills in TWD. That not only solves the card problem but also brings the benefits of unified invoices and monthly accounting. This article explains exactly how to move, and it should take about 30 minutes.

Mindset Before Migrating

After switching to a relay provider (such as BazaarLink), the API format your code calls stays exactly the same (it is still OpenAI-compatible). The only differences are:

1. The base_url changes to the relay provider's endpoint
2. The API key is replaced with a key issued by the relay provider
3. The original vendor key no longer needs to appear in your code or environment variables

Step 1: Change the Base URL and Key (5 minutes)

from openai import OpenAI

client = OpenAI(
    base_url="https://bazaarlink.ai/api/v1",
    api_key="sk-bl-YOUR_API_KEY",
)

completion = client.chat.completions.create(
    model="openai/gpt-5.6-luna",
    messages=[{"role": "user", "content": "Test message"}],
)
print(completion.choices[0].message.content)

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://bazaarlink.ai/api/v1",
  apiKey: "sk-bl-YOUR_API_KEY",
});

const completion = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-4.6",
  messages: [{ role: "user", content: "Test message" }],
});

Step 2: List Out the Model Mapping (10 minutes)

The vendor API's model parameter is usually a bare model name (for example gpt-5.6-luna). Relay providers, to support multiple vendors at once, conventionally add a vendor prefix in front (for example openai/gpt-5.6-luna, anthropic/claude-sonnet-4.6, google/gemini-3.7-flash). When migrating, we recommend first writing down every model string currently used in your code in a table, and mapping each one to its new full ID, so that you do not miss an update and cause a call path to fail.

Step 3: Create Project-Specific Keys and Set Spending Caps (10 minutes)

Do not share the vendor key or a newly issued key across all projects. We recommend a separate key for each project and each deployment environment, with a spending cap. That way, even if one key leaks by accident or a bug in your logic hammers the API, the maximum loss stays within an acceptable range.

curl https://bazaarlink.ai/api/v1/keys \
  -H "Authorization: Bearer sk-bl-YOUR_MANAGEMENT_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "prod-backend",
    "limit": 100,
    "limit_reset": "monthly"
  }'

limit is the spending cap (priced in USD), and limit_reset can be set to reset daily, weekly, or monthly. Creating keys requires calling with the account's management key. That management key cannot be used to call models; it can only manage other keys, which is one more layer of protection.

Step 4: Confirm Invoice and Monthly Billing Needs (5 minutes)

If your company needs unified invoices, this is part of the billing setup and requires no separate integration. The relay provider is itself a Taiwan company. Billing is in USD with quotes in TWD (updated daily based on the exchange rate), and unified invoices can be issued directly. If your usage is steady and you prefer monthly billing over topping up each time, enterprise plans can usually negotiate monthly invoicing (Net-30, payment terms negotiable). We recommend confirming this with your finance team at the time of the move so you do not have to add steps later.

Pre-Launch Checklist

• The base_url has been changed in all code, with no background jobs or scheduled scripts left out
• The vendor API key has been removed from environment variables, CI/CD settings, and the deployment platform's environment variables
• Each project and environment uses its own separate key, not one shared key for everything
• Every key has a spending cap set, not unlimited
• The model ID mapping table has been checked item by item, including models used by background jobs and scheduled scripts
• A complete test run has been done with a low-limit key (including the error-handling paths), confirming the response format matches the original, before switching to production
• Finance and accounting know the new billing and invoicing method

Closing

Being declined on an overseas card usually cannot be fixed directly, because you have no control over the bank's risk logic. What you can control is whether you keep relying on a payment path that breaks easily. Moving to a local Taiwan provider that bills in TWD requires very small code changes (essentially just swapping the base URL), yet it addresses three problems at once: card risk, invoice documentation, and monthly accounting. It is worth carving out a free slot to do it in one go.

TWD billing · Taiwan invoices · leading AI models · OpenAI-compatible API