PayPal Error: We’re sorry things don’t appear to be working at the moment. please try again later

Issue : Customers are receiving error: Things don't appear to be working at the moment. Please try again later.

This error typically occurs for two reasons:

1.) You have entered your PayPal email address or PayPal Identity Token incorrectly. Please confirm your PayPal email address and PayPal Identity Token are entered correctly within Downloads => Settings => Payment Gateways => PayPal Standard

Or

2.) Your customers may also see this if Encrypted Website Payments set to ON. Setting it to OFF will resolve the issue. This setting can be adjusted from within your PayPal account by navigating to Profile => Profile and Settings => Selling Preferences => (Website Payment Preferences/Website Preferences) and selecting OFF under Encrypted Website Payments

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Check paypal setting at Admin panel and Paypal account bothhttps://docs.woocommerce.com/document/paypal-standard/

Your Instant Payment Notification (IPN) URL must match your store's URL

Under Profile & Settings > SElling Tools > Instant payment notificationsClick update, then add your store's URL

You also need to check API access > NVP/SOAP API integration (Classic) In the section Credential Signature , find these values and submit it to your Woocommerce payment settings

1. API Username
2. API Password
3. Signature