Error Type: PayPal IPN
Error on customer's side: During the checkout, when customer is navigated to the PayPal site, it says "Things don't appear to be working at the moment. Please try again later."
Order status: The order status is left Pending
Customization: NO
Settings in administration section: Billing address is disabled in this case during checkout process. Billing address can't be mandatory in this case because of some products with $0 price and some paid. It will be a bad user-experience to ask for billing address for products with $0 price.
Website Log:
Log level
Error
Short message
PayPal IPN. Order is not found
Full message
Nop.Core.NopException: Paypal IPN: mc_gross: XX.00 invoice: XXXX- XXXX - XXXX - XXXX - XXXX protection_eligibility: Eligible address_status: confirmed item_number1: payer_id: XXXXXXXX tax: X.00 address_street: XXXX payment_date: XXXXX+2017+PDT payment_status: Completed invoice_id: XXXX-XXXX-XXXX-XXXX charset: windows-1234 address_zip: XXXXXX first_name: XXXX mc_fee: X.00 address_country_code: US address_name: XXXX notify_version: 3.8 custom: 0 payer_status: verified business: XXXXXX.com address_country: United+States num_cart_items: 1 address_city: XXXXX verify_sign: XXXXXX payer_email: XXXXXX.com txn_id: XXXXXXX payment_type: instant payer_business_name: XXXXX last_name: XXXX: TX item_name1: XXXXXX receiver_email: XXXXX.com payment_fee: X.00 quantity1: 1 receiver_id: XXXXX txn_type: invoice_payment mc_gross_1: XX.00 mc_currency: USD residence_country: US transaction_subject: invoice_number: XXXX payment_gross: XX.00 ipn_track_id: XXXXX New payment status: Paid