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If you connected your own WhatsApp Business Account, Meta charges WhatsApp’s message fees to a card on your Meta account. Until that card works, Meta blocks the messages your business starts. You may see this on Connect WhatsApp:
There is an error with the payment method. This will block business initiated conversations. Please add a new payment method to the account.
It’s quick to fix, and nothing in ThinnestAI needs to change.

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Why it happens

Meta and ThinnestAI send separate bills (how the two bills work): Your ThinnestAI balance can’t pay Meta. With no working card, Meta blocks the conversations you start: templates and broadcasts. Replies to customers who messaged you first, inside the 24-hour window, keep working.

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Which account to add it to

The card goes on the Meta business that owns your WhatsApp Business Account, not on your personal Facebook profile.
  • The business is usually named after you or your company. It’s the one you chose, or created, in Meta’s popup when you connected WhatsApp.
  • If you manage several businesses in Meta, the card must be on the one that holds this WhatsApp account. A card on another business doesn’t count.

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Where to add it

  1. Open business.facebook.com/latest/billing_hub/payment_methods, signed in with the Facebook account you used to connect WhatsApp.
  2. At the top left, check that the business that owns your WhatsApp account is selected. Switch to it if not.
  3. Click Add payment method.
  4. Choose your country and currency (for India: India, INR), then enter your card and business details.
  5. Save. If Meta asks which payment method your WhatsApp account should use, choose this card.

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Which payment methods work

  • A credit or debit card. Visa and Mastercard work most reliably.
  • The card must allow online and international transactions. Many Indian cards have these switched off by default; turn them on in your bank’s app or net banking before adding the card. A card with them off is accepted at first, then fails when Meta charges it, and the block comes back.
  • Meta lists the options available for your country when you click Add.

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What happens next

  • Once Meta accepts the card, the block usually lifts within minutes.
  • Then open or reload Connect WhatsApp in ThinnestAI. That’s when we ask Meta for your account’s status: the warning clears straight away, and your messages go out normally.
  • You don’t need to reconnect your number or change anything in ThinnestAI.
“I’ve added it” on Connect WhatsApp is a reminder, not a check. We can’t see your Meta payment details, so ticking it only stops us asking. Whether Meta can actually charge your card is what decides if messages go out, and if it can’t, the warning comes back on its own.

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Also worth doing: business verification

Meta may also show your business as not yet verified. That doesn’t block you, but until it’s done Meta limits how many new people you can message each day. Start it in Meta Business Settings → Security Centre → Start verification; you’ll need your business documents. See Business verification for what Meta asks for.

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Still blocked?

If the warning is still there when you reload Connect WhatsApp an hour after adding a working card, use Contact support (the help icon at the top of the app) and we’ll check your account’s status with Meta.