I have the same issue while implementing IAP in dev environment. I guest it's related to In-app purchases do not work on the simulator things. Before doing receipt validation and encounter the problem bakedPotato mentioned, I got problem loading products, and have worked around - https://stackoverflow.com/questions/58020258/requesting-an-in-app-purchase-in-ios-13-fails. Then I tested the receipt and always 21002. I tried sample receipts from internet (and my old pre-iOS 13 receipt data) with same curl script and succeeded. Then I decoded the base64 with online decoder and compared pre-iOS 13 receipts with new one. It seems the new one has different information from old one, for examples, it misses something like "ProductionSandbox0", "#Apple Worldwide Developer Relations"..., but it has "Xcode0", "StoreKit1" that are not in the pre-iOS 13 one. Sample pre-iOS 13 receipts - https://stackoverflow.com/a/53286406/1627853 New receipt: MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwGggCSABIIBOzGCATcwDwIBAAIBAQQHDAVYY29kZTALAgEBAgEBBAMCAQAwFwIBAgIBAQQPDA1jb20uYnVraS5idWtpMAwCAQMCAQEEBAwCNzkwEAIBBAIBAQQIse//TgcAAAAwHAIBBQIBAQQUjIZ+RiRb9aC7bpQ3J2LCtkv3vhMwCgIBCAIBAQQCFgAwIgIBDAIBAQQaFhgyMDIxLTAzLTA4VDE3OjQ4OjM0KzA4MDAwbAIBEQIBAQRkMWIwDAICBqUCAQEEAwIBATAjAgIGpgIBAQQaDBhjb20uYnVraS5idWtpLmNvaW5zLjMwMDAwDAICBqcCAQEEAwwBMDAfAgIGqAIBAQQWFhQyMDIxLTAzLTA4VDE3OjQ4OjM0WjAiAgEVAgEBBBoWGDQwMDEtMDEtMDFUMDg6MDA6MDArMDgwMAAAAAAAAKCCA3gwggN0MIICXKADAgECAgEBMA0GCSqGSIb3DQEBCwUAMF8xETAPBgNVBAMMCFN0b3JlS2l0MREwDwYDVQQKDAhTdG9yZUtpdDERMA8GA1UECwwIU3RvcmVLaXQxCzAJBgNVBAYTAlVTMRcwFQYJKoZIhvcNAQkBFghTdG9yZUtpdDAeFw0yMDA0MDExNzUyMzVaFw00MDAzMjcxNzUyMzVaMF8xETAPBgNVBAMMCFN0b3JlS2l0MREwDwYDVQQKDAhTdG9yZUtpdDERMA8GA1UECwwIU3RvcmVLaXQxCzAJBgNVBAYTAlVTMRcwFQYJKoZIhvcNAQkBFghTdG9yZUtpdDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBANt/kDwscw/blyZLk7sK+KEhPshh2STIXh91PtqT2zEakYC5v+UMyzy7DkRiJvoEKbZJ52/gG+YNaM0lbsN2CPVKC656dDzEqQuzz2IP+7S899uEXijrRw3x7Yus9Z+wCTijbnvLJlAKGuGJ0XJ2CzlMy09uwLNft5W6uahdSnSr729BpX4Jjbo9Pc1wV9jt79Xad8iTBBzvCYh4Zc6B8o1y5wcabiYS9zKxDbs4kGsGxPwN5ZVQzZHIuiX0WMmM4XHbSkXzLRmWA1aBpkTudXdbU894rF26Pl9QK1wpjN3C1yoX3yK01+R4qK+obafB2mgtZszPKQtQLOPC++ZfEsECAwEAAaM7MDkwDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8BAf8EBAMCAoQwFgYDVR0lAQH/BAwwCgYIKwYBBQUHAwMwDQYJKoZIhvcNAQELBQADggEBALIA4Dzx6OlivcDWHUCeV7k4kHd2UtKoS3BuuGeZ+7OKVZ/vHSi4XyrRc581Rze7RtN2EPLwaezNYplx+WCKhEg4xL2LZyW5q2wzZa3Ywpp4SA/pzMEnDcbPZDxtgFkzjMo2BioRG41Jzgj/ZsBHKEvrWsErCVYspaoJA3syMdzohXhIzsDFEhFqDwyuLwXKb3pkfyAsdeZMsRLT/eMfXg19uFjXoHzkf2Orl5orwyrY0LLh1VoNORtvZyipEoPWh3htmb1eswrgmM726sOObWnrt0CBPYc9cFHRxF2Npdx/alga3mB2N1Ls/6wZXQwVL4oP9YnI1ysdHuwrkQWnPU8xggGPMIIBiwIBATBkMF8xETAPBgNVBAMMCFN0b3JlS2l0MREwDwYDVQQKDAhTdG9yZUtpdDERMA8GA1UECwwIU3RvcmVLaXQxCzAJBgNVBAYTAlVTMRcwFQYJKoZIhvcNAQkBFghTdG9yZUtpdAIBATANBglghkgBZQMEAgEFADANBgkqhkiG9w0BAQsFAASCAQAlfjPYZ/c32kRxPfA05Dx+vfq2Ri6t/FecNic3T135VWnP6ameGee377IW+wzx8vlzBYN3hzDd9Byx+S/UXmayXwApQnm0yLeGnrmHd+wPt+isBY6gFBAoUE3fvhVga7jjxzB7o+2Pm7LI+eLYjTIuODLXmD/54fmF1l31Us/3+vc4scvW0d63vsRbt5bJHIMqOG/JNvtetQmvl8xZa7wehOCPKi1W6aKEMWJalce7fD2Ps2EYqS1OWawj0IseqSfuCTLz5OMq+TFSEYn8bjmTBgygihP6AK2sRBealAxeNBtH+Jy9F8pP1ubbfkKWMSuOz1iAvQCbp0LQPxQdFE9LAAAAAAAA I will try ad-hoc later and I guess it will get right there.