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2. è€æ°ã®æ±ºæžã²ãŒããŠã§ã€ãšã®çµ±å
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1. æç€ºçãªãã©ã³ã¶ã¯ã·ã§ã³ã¿ã€ãã®å®çŸ©
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enum TransactionType {
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REFUND,
SUBSCRIPTION,
TRANSFER
}
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2. 匷åãªåãã§ãã¯
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3. èªèšŒãšèªå¯
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4. å ¥åæ€èšŒ
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