fix(payverse): 결제 payload에 customerId 길이 30자로 제한

- customerId를 sha1 기반 30자 이내로 생성하도록 변경하여 스펙 준수
- 불필요한 billkeyReq 제거

src/main/kotlin/kr/co/vividnext/sodalive/can/charge/ChargeService.kt

@@ -36,7 +36,6 @@ import java.math.BigDecimal
 import java.math.RoundingMode
 import java.time.LocalDateTime
 import java.time.format.DateTimeFormatter
-import java.util.UUID
 
 @Service
 @Transactional(readOnly = true)
@@ -232,7 +231,7 @@ class ChargeService(
         val sign = DigestUtils.sha512Hex(
             String.format("||%s||%s||%s||%s||%s||", payverseSecretKey, payverseMid, chargeId, amount, reqDate)
         )
-        val customerId = UUID.nameUUIDFromBytes("${serverEnv}_user_${member.id!!}".toByteArray()).toString()
+        val customerId = "${serverEnv}_user_${member.id!!}"
         val requestCurrency = "KRW"
 
         val payload = linkedMapOf(
@@ -244,8 +243,6 @@ class ChargeService(
             "requestCurrency" to requestCurrency,
             "requestAmount" to amount,
             "reqDate" to reqDate,
-            "billkeyReq" to "N",
-            "mallReserved" to "",
             "sign" to sign
         )
         val payloadJson = objectMapper.writeValueAsString(payload)