App内課金におけるトラブルを劇的に減らすための取り組み

by Koki Hirokawa

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AbemaTV, Inc. All Rights Reserved App಺՝ۚͷछྨ 6 ● ফ໣ܕ ○ Ұ౓͚ͩ࢖༻ՄೳͰɺ࠶౓࢖༻͢Δʹ͸৽ͨʹߪೖ͢Δඞཁ͕͋Δ ○ αʔϏε಺௨՟ ● ඇফ໣ܕ ○ Ұ౓͚ͩߪೖ͢Ε͹ɺݮΔ͜ͱͳ͘ແظݶʹ࢖༻Մೳͳ੡඼ ○ ޿ࠂͷඇදࣔػೳ ● ࣗಈߋ৽αϒεΫϦϓγϣϯ ○ ॴఆͷظؒதɺਵ࣌ߋ৽͞ΕΔίϯςϯπΛߪೖͰ͖Δ੡඼ɻϢʔβ͕ղ໿͠ͳ͍ݶΓࣗಈత ʹߋ৽͞ΕΔ ○ ಈը΍Իָͷ഑৴ ● ඇߋ৽αϒεΫϦϓγϣϯ ○ ظؒݶఆͷαʔϏε΍ίϯςϯπ΁ͷΞΫηεݖΛߪೖͰ͖Δɻࣗಈߋ৽͸͞Εͳ͍ ○ ήʔϜ಺ίϯςϯπͷγʔζϯύε

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AbemaTV, Inc. All Rights Reserved StoreKit 10 ● App಺՝ۚΛ࣮૷͢ΔͨΊʹඞཁͳϑϨʔϜϫʔΫ ○ ͦͷଞɺΞϓϦͷϨϏϡʔͳͲ App Store ͱͷ࿈ܞΛαϙʔτ͢Δ ● Original API ͱ StoreKit 2 ○ Original API ■ StoreKit 2 ͕ొ৔͢ΔલͷɺैདྷͷAPI ■ iOS 3.0+ ○ StoreKit 2 ■ WWDC 2021 Ͱൃද͞Εͨ৽نAPIͰɺSwift Concurrency Λ࠾༻ͨ͠Ϟμϯͳ I/F ■ iOS15.0+

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AbemaTV, Inc. All Rights Reserved StoreKit 11 ● App಺՝ۚΛ࣮૷͢ΔͨΊʹඞཁͳϑϨʔϜϫʔΫ ○ ͦͷଞɺΞϓϦͷϨϏϡʔͳͲ App Store ͱͷ࿈ܞΛαϙʔτ͢Δ ● Original API ͱ StoreKit 2 ○ Original APIʢར༻தʣ ■ StoreKit 2 ͕ొ৔͢ΔલͷɺैདྷͷAPI ■ iOS 3.0+ ○ StoreKit 2 ■ WWDC 2021 Ͱൃද͞Εͨ৽نAPIͰɺSwift Concurrency Λ࠾༻ͨ͠Ϟμϯͳ I/F ■ iOS15.0+

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AbemaTV, Inc. All Rights Reserved 15 1000 ίΠϯʢ1200 ԁʣΛߪೖͨ͠ɻ ͔͠͠ɺApple ͔Β͸ 2000 ίΠϯ෼ʢ2400 ԁʣͷ੥ٻ ͕དྷ͍ͯΔɻ 1000 ίΠϯ෼ʢ1200 ԁʣΛฦۚͯ͠ཉ͍͠ɻ Ϣʔβ͔Βͷ໰͍߹Θͤ 1000 ίΠϯ Expected 1000 ίΠϯ × 2 Actual ҙਤͤͣ2ճߪೖ͞Εͯ͠·͏τϥϒϧ͕ൃੜ ‛ ABEMAίΠϯͷॏෳߪೖ

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AbemaTV, Inc. All Rights Reserved τϥϯβΫγϣϯΛऴྃ͢ΔλΠϛϯά 21 (※1) https://developer.apple.com/documentation/storekit/skpaymentqueue/1506003-finishtransaction ● ΞϓϦ͔Β໌ࣔతʹऴྃͤ͞Δ ● ABEMAίΠϯߪೖͷτϥϯβΫγϣϯ͸ɺABEMAͷαʔόʹͯϢʔβ΁ͷίΠϯ෇༩Λߦͬ ͨͷͪʹ SQPaymentQueue.finishTransaction(_:) Λݺͼग़͢͜ͱͰऴྃͤ͞Δ ○ > After you finish a transaction, don’t take any actions on it or do any work to deliver the product. If any work remains, your app isn’t ready to finish the transaction. (※1) ● Ϣʔβ΁ͷ੥ٻͷΈߦΘΕɺίΠϯ͕෇༩͞Εͳ͍ঢ়ଶΛ๷͙ ● ফ໣ܕ͸Կ౓Ͱ΋ߪೖͰ͖ɺաڈʹߪೖͨ͜͠ͱ͕͋Δ঎඼Λ࠶౓ߪೖͨ͠৔߹ɺϨγʔτͷ ߪೖཤྺ্͕ॻ͖͞ΕΔɻաڈͷߪೖཤྺΛࢀরͰ͖ͳ͘ͳΔՄೳੑ͕͋ΔͨΊ஫ҙ͕ඞཁ

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AbemaTV, Inc. All Rights Reserved ະ׬ྃτϥϯβΫγϣϯ - Apple΁ͷߪೖϦΫΤετ 24 ● ϑΝϛϦʔڞ༗ͷঝೝ଴ͪ ○ ঝೝͱߪೖͷϦΫΤετͷઃఆ͕͞Ε͍ͯΔ৔߹ɺϑΝϛϦʔڞ༗ͷ؅ཧऀ͕ঝೝ ͢Δ·Ͱ͸ߪೖ͕อཹͱͳΔ ○ ※ ঝೝ͞ΕΔ·Ͱ੥ٻ͸͞Εͳ͍ ● SQPaymentQueue.finishTransaction(_:) ͷΤϥʔ ○ Apple ͔ΒΤϥʔʢ SKPaymentTransactionState.failed ʣ͕ฦ͖ͬͯͨ৔߹ʹݺͼ ग़͕ͨ͠ɺࣦഊͨ͠ͱ͖ ○ Throwing function ʹ͸ͳ͍ͬͯͳ͍ͷͰ஫ҙ ○ > In rare circumstances, this call might fail, and you'll receive updates for that transaction again. (※1) (※1) https://developer.apple.com/documentation/storekit/skpaymentqueue/1506026-transactions

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AbemaTV, Inc. All Rights Reserved ະ׬ྃτϥϯβΫγϣϯ - τϥϯβΫγϣϯͷऴྃ 28 ● SQPaymentQueue.finishTransaction(_:) ͷΤϥʔ ○ Throwing function ʹ͸ͳ͍ͬͯͳ͍ͷͰ஫ҙ ○ > In rare circumstances, this call might fail, and you'll receive updates for that transaction again. (※1) (※1) https://developer.apple.com/documentation/storekit/skpaymentqueue/1506026-transactions

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AbemaTV, Inc. All Rights Reserved ະ׬ྃτϥϯβΫγϣϯͷϋϯυϦϯά 29 ● ಛఆͷλΠϛϯάͰະ׬ྃτϥϯβΫγϣϯΛ֬ೝ͠ɺߪೖॲཧΛϦτϥΠ ○ ΞϓϦىಈ࣌ ○ όοΫάϥ΢ϯυ͔ΒϑΥΞάϥ΢ϯυʹͳͬͨ࣌ ○ ίΠϯ࢒ߴදࣔ࣌ ● Ϣʔβ͕ίΠϯ࢒ߴΛ֬ೝ͢ΔલʹϦτϥΠ͠ɺෆ੔߹ͳঢ়ଶΛૣ͘ղফ͢ΔΑ͏ʹͨ͠ ● ະ׬ྃτϥϯβΫγϣϯ͸ SKPaymentQueue.transactions Ͱऔಘ

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AbemaTV, Inc. All Rights Reserved ΫϥΠΞϯτϩάͷௐࠪ 39 ● ͓໰͍߹Θ͕ͤ͋ͬͨϢʔβ͸ɺίΠϯߪೖͷϦτϥΠॲཧΛߦ͍ͬͯͨ ○ prefix͕retryͷߪೖϓϩηεIdΛ֬ೝ ○ ϦτϥΠॲཧࣗମ͸໰୊ͳ͘ߦΘΕ͍ͯΔΑ͏ͩͬͨ ● 2ճ໨ͷߪೖॲཧ͸ϢʔβʹΑͬͯ։࢝͞Ε͍ͯͨ ○ Ϣʔβ͕ߪೖϘλϯΛԡԼͨ͜͠ͱΛද͢ߪೖϓϩηεID͕֬ೝͰ͖ͨ ○ ߪೖϘλϯͷ࿈ଧରࡦ΍ɺߪೖॲཧதͷը໘ϩοΫ͸ߦ͍ͬͯͨ

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AbemaTV, Inc. All Rights Reserved طଘ࣮૷ͷ໰୊఺Λ୳Δ 41 ● طଘͷ࣮૷Ͱ͸ɺϢʔβ͕ίΠϯ࢒ߴΛ֬ೝ͢ΔલͷಛఆλΠϛϯάʹ͓͍ͯɺ҉໧తʹϦ τϥΠॲཧΛ࣮ߦ͠ɺϢʔβͷෆ੔߹ʢ=ίΠϯ࢒ߴͷߋ৽ʣΛ͍ͪૣ͘ղফ͢Δ͜ͱΛ໨ ࢦ͍ͯͨ͠ ● ߪೖ͕ࣦഊͨ͠ࡍʹɺϢʔβ͸࠶౓ߪೖϘλϯΛԡ͢͜ͱͰෆ੔߹Λղফ͠Α͏ͱ͢ΔͷͰ ͸ͳ͍͔ ○ ߪೖ࣌ʹະ׬ྃτϥϯβΫγϣϯ͕͋Δ৔߹͸ΤϥʔͱͳΔ͕ɺίΠϯߪೖը໘ʹભ Ҡ͢ΔલʹϦτϥΠॲཧ͕׬ྃ͠ɺίΠϯ࢒ߴ͕ߋ৽͞Ε͍ͯΔ͜ͱʹؾ͔ͮͣɺͦͷ ··ߪೖϘλϯΛԡͯ͠͠·͏(?)

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AbemaTV, Inc. All Rights Reserved 42 ● ىಈγʔέϯεऴྃޙʹະ׬ྃτϥϯβΫγϣϯͷ༗ແΛ֬ೝ͠ɺߪೖ్தͷίΠϯ͕͋Δ ͜ͱΛΞϥʔτදࣔͰ఻͑ΔΑ͏ʹͨ͠ ○ όοΫάϥ΢ϯυ͔ΒϑΥΞάϥ΢ϯυʹͳͬͨͱ͖, ίΠϯ࢒ߴΛදࣔ͢Δ৔߹΋ ● Before ○ ίΠϯ࢒ߴͷෆ੔߹Λ͍ͪૣ͘ղফ͢Δ ● After ○ ίΠϯ࢒ߴͷෆ੔߹Λ͍ͪૣ͘ೝࣝͯ͠΋Β͏ վળ఺ᶃ - ߪೖ్தͷίΠϯͷଘࡏΛ͍ͪૣ͘఻͑Δ

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AbemaTV, Inc. All Rights Reserved ΞϓϦىಈ௚ޙ͔ΒτϥϯβΫγϣϯͷߋ৽Λ؂ࢹ 45 ● After ○ ΞϓϦىಈ௚ޙ UIApplicationDelegate.application(_:didFinishLaunchingWithOptions:) ʹ SKPaymentTransactionObserver.paymentQueue(_:updatedTransactions:) Λར༻͠ ͯະ׬ྃτϥϯβΫγϣϯΛड͚औΔʢ؂ࢹ͢ΔʣΑ͏ʹͨ͠ ○ Appleਪ঑ (※1) ● Before ○ ΞϓϦىಈɾόοΫϑΥΞɾίΠϯ࢒ߴදࣔ࣌ʹ SQPaymentQueue.transactions Λར ༻ͯ͠ະ׬ྃτϥϯβΫγϣϯΛड͚औΔ ■ > The value of this property is undefined when there are no observers attached to the payment queue. (※2) (※1) https://developer.apple.com/documentation/storekit/in-app_purchase/original_api_for_in-app_purchase/setting_up_the_transaction_observer_for_the_payment_queue (※2) https://developer.apple.com/documentation/storekit/skpaymentqueue/1506026-transactions

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AbemaTV, Inc. All Rights Reserved ● ϦτϥΠॲཧ׬ྃ࣌ʹɺ੒ޭ·ͨ͸ࣦഊͷεφοΫόʔΛ දࣔ ○ Ϣʔβ͸ίΠϯ࢒ߴ͕දࣔ͞ΕΔը໘ʹભҠͤͣͱ ΋ɺଈ࠲ʹ݁ՌΛड͚औΔ͜ͱ͕Ͱ͖Δ ○ εφοΫόʔ ■ Ϣʔβͷը໘ૢ࡞Λ્֐͢Δ͜ͱͳ͘ԿΒ͔ͷ ৘ใΛ఻͑Δࡍʹར༻͢Δڞ௨ίϯϙʔωϯτ ■ ը໘Լ෦ʹදࣔ͞ΕɺҰఆ࣌ؒͰࣗಈతʹඇද ࣔͱͳΔ վળ఺ᶄ - ϦτϥΠॲཧ׬ྃͷεφοΫόʔදࣔ 52

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AbemaTV, Inc. All Rights Reserved ● खݩͰͷ࠶ݱ֬ೝ͕औΕͳ͍ABEMAίΠϯͷॏෳߪೖτϥϒϧʹର͠ɺߪೖϓϩηεͷϩάΛ ऩू͢Δ͜ͱͰݪҼͷ෼ੳɾԾઆཱͯΛߦͬͨ ● ߪೖ్தͷίΠϯͷଘࡏͱɺϦτϥΠॲཧͷ݁ՌΛ͍ͪૣ͘఻͑Δ͜ͱͰɺϢʔβ͕2౓໨ͷߪ ೖΛ։࢝͢ΔͷΛ๷͍ͩ ● ެࣜυΩϡϝϯτʹهࡌ͞Εͨ I/F ͷར༻ํ๏΍஫ҙ఺͸ஸೡʹಡ΋͏ ·ͱΊ 55

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