Good day @VixieTSQ, Thank you for posting to the PayPal community. I regret to inform you that there is currently no option to add tips in the Order API. However, depending on how your website is set up, you can create a text box for customers to enter a tip amount. This can be done during the checkout process, where the product amount and tip amount will be added together to calculate the total amount. If you still facing issues, please create an MTS ticket via - https://www.paypal-support.com/s/?language=en_US with the detailed information and error details. Sincerely, Vaishnavi PayPal MTS If this post or any other was helpful, please enrich the community by giving kudos or accepting it as a solution.
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