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Or is there an online portal somewhere I can pay that back?
No, there's no portal for you to pay your repayment of your Advanced Premium Tax Credit. TurboTax calculates the repayment amount and it is calculated in your tax liability. Since you are receiving a refund, what you have to repay is deducted from your refund. You'll see the amount on your Form 8962 and Schedule 3, line 9 of your 1040.
For more information, review the TurboTax articles What is the Premium Tax Credit (PTC) and What is Tax Form 8962?
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