feat(charge): payloadJson의 amount

- 소수점 아래 불필요한 0을 제거

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

@@ -265,7 +265,12 @@ class ChargeService(
         val savedCharge = chargeRepository.save(charge)
 
         val chargeId = savedCharge.id!!
-        val amount = savedCharge.payment!!.price.setScale(4, RoundingMode.HALF_UP).stripTrailingZeros()
+        val amount = BigDecimal(
+            savedCharge.payment!!.price
+                .setScale(4, RoundingMode.HALF_UP)
+                .stripTrailingZeros()
+                .toPlainString()
+        )
         val reqDate = savedCharge.createdAt!!.format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss"))
         val sign = DigestUtils.sha512Hex(
             String.format(
@@ -374,7 +379,8 @@ class ChargeService(
                     } else {
                         throw SodaException("결제정보에 오류가 있습니다.")
                     }
-                } catch (_: Exception) {
+                } catch (e: Exception) {
+                    e.printStackTrace()
                     throw SodaException("결제정보에 오류가 있습니다.")
                 }
             }