Hi @prince341,
Thank you for posting to the PayPal Merchant Community.
You may need to reach out to BigCommerce to see what options they have available since they provide a no-code checkout solution, but the "commit" parameter in our JavaScript SDK will bring your customer back to your checkout page to finalize their order after they sign into their PayPal account when it is set to "false" [https://developer.paypal.com/sdk/js/configuration/#link-commit]. Once the customer is brought back to your page you can make any necessary changes to the final amount after applying shipping, taxes, or other fees.
Please let us know if you have any additional questions.
Sincerely,
John
MTS
PayPal
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