question

The issue likely arises because the API may not automatically include the tax amount in the total payment unless explicitly specified in the logic. To resolve this, verify if the API requires you to add the tax amount to the amount manually before sending the request. You can consult the API documentation or involve a tax accountant to ensure the tax calculation aligns with compliance and business logic.

The tax amount is not being added to the final total because the API may not correctly handle the tax inclusion in the total calculation. Double-check if the amount and taxAmount are being summed up in the backend logic before displaying the total. Ensure that both the amount and taxAmount are passed correctly, and the final total is calculated as amount + taxAmount. Also, confirm if the API accepts tax values as part of the total or requires special handling for tax calculation.