Sometimes, Paypal Error:OrderTotal (Amt): Required parameter missing or "Bad Math" errorappear on the checkout screen, whenever FormBuilder has multiple checkboxes with identical words. Please refer to this article to resolve the issue.
When you create an eCommerce product with greyed-out button/product, this means that your items are set to not in stock. Please check this article to solve the issue.
At this time, PayPal's standard APIs do not support Indian Rupees. This means, when setting up payment in a POWR app, users based in India will need to choose another default currency to be displayed in the checkout. We recommend using a common currency, such as Euro, US Dollars, or British Pounds. For more details, please check this article.