diff --git a/internal/contract/campaign_contract.go b/internal/contract/campaign_contract.go
index d64bbb5..bb5e479 100644
--- a/internal/contract/campaign_contract.go
+++ b/internal/contract/campaign_contract.go
@@ -3,33 +3,35 @@ package contract
 import (
 	"time"
 
+	"apskel-pos-be/internal/entities"
+
 	"github.com/google/uuid"
 )
 
 // Request Contracts
 type CreateCampaignRequest struct {
-	Name        string                  `json:"name" binding:"required,min=1,max=150"`
-	Description *string                 `json:"description,omitempty"`
-	Type        string                  `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
-	StartDate   time.Time               `json:"start_date" binding:"required"`
-	EndDate     time.Time               `json:"end_date" binding:"required"`
-	IsActive    bool                    `json:"is_active"`
-	ShowOnApp   bool                    `json:"show_on_app"`
-	Position    int                     `json:"position" binding:"min=0"`
-	Metadata    *map[string]interface{} `json:"metadata,omitempty"`
+	Name        string             `json:"name" binding:"required,min=1,max=150"`
+	Description *string            `json:"description,omitempty"`
+	Type        string             `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
+	StartDate   time.Time          `json:"start_date" binding:"required"`
+	EndDate     time.Time          `json:"end_date" binding:"required"`
+	IsActive    bool               `json:"is_active"`
+	ShowOnApp   bool               `json:"show_on_app"`
+	Position    int                `json:"position" binding:"min=0"`
+	Metadata    *entities.Metadata `json:"metadata,omitempty"`
 }
 
 type UpdateCampaignRequest struct {
-	ID          uuid.UUID               `json:"id" binding:"required"`
-	Name        string                  `json:"name" binding:"required,min=1,max=150"`
-	Description *string                 `json:"description,omitempty"`
-	Type        string                  `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
-	StartDate   time.Time               `json:"start_date" binding:"required"`
-	EndDate     time.Time               `json:"end_date" binding:"required"`
-	IsActive    bool                    `json:"is_active"`
-	ShowOnApp   bool                    `json:"show_on_app"`
-	Position    int                     `json:"position" binding:"min=0"`
-	Metadata    *map[string]interface{} `json:"metadata,omitempty"`
+	ID          uuid.UUID          `json:"id" binding:"required"`
+	Name        string             `json:"name" binding:"required,min=1,max=150"`
+	Description *string            `json:"description,omitempty"`
+	Type        string             `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
+	StartDate   time.Time          `json:"start_date" binding:"required"`
+	EndDate     time.Time          `json:"end_date" binding:"required"`
+	IsActive    bool               `json:"is_active"`
+	ShowOnApp   bool               `json:"show_on_app"`
+	Position    int                `json:"position" binding:"min=0"`
+	Metadata    *entities.Metadata `json:"metadata,omitempty"`
 }
 
 type ListCampaignsRequest struct {
@@ -53,26 +55,26 @@ type DeleteCampaignRequest struct {
 
 // Campaign Rule Request Contracts
 type CreateCampaignRuleRequest struct {
-	CampaignID     uuid.UUID               `json:"campaign_id" binding:"required"`
-	RuleType       string                  `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
+	CampaignID     uuid.UUID          `json:"campaign_id" binding:"required"`
+	RuleType       string             `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
 }
 
 type UpdateCampaignRuleRequest struct {
-	ID             uuid.UUID               `json:"id" binding:"required"`
-	CampaignID     uuid.UUID               `json:"campaign_id" binding:"required"`
-	RuleType       string                  `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
+	ID             uuid.UUID          `json:"id" binding:"required"`
+	CampaignID     uuid.UUID          `json:"campaign_id" binding:"required"`
+	RuleType       string             `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
 }
 
 type ListCampaignRulesRequest struct {
@@ -93,33 +95,33 @@ type DeleteCampaignRuleRequest struct {
 
 // Response Contracts
 type CampaignResponse struct {
-	ID          uuid.UUID               `json:"id"`
-	Name        string                  `json:"name"`
-	Description *string                 `json:"description,omitempty"`
-	Type        string                  `json:"type"`
-	StartDate   time.Time               `json:"start_date"`
-	EndDate     time.Time               `json:"end_date"`
-	IsActive    bool                    `json:"is_active"`
-	ShowOnApp   bool                    `json:"show_on_app"`
-	Position    int                     `json:"position"`
-	Metadata    *map[string]interface{} `json:"metadata,omitempty"`
-	Rules       []CampaignRuleResponse  `json:"rules,omitempty"`
-	CreatedAt   time.Time               `json:"created_at"`
-	UpdatedAt   time.Time               `json:"updated_at"`
+	ID          uuid.UUID              `json:"id"`
+	Name        string                 `json:"name"`
+	Description *string                `json:"description,omitempty"`
+	Type        string                 `json:"type"`
+	StartDate   time.Time              `json:"start_date"`
+	EndDate     time.Time              `json:"end_date"`
+	IsActive    bool                   `json:"is_active"`
+	ShowOnApp   bool                   `json:"show_on_app"`
+	Position    int                    `json:"position"`
+	Metadata    *entities.Metadata     `json:"metadata,omitempty"`
+	Rules       []CampaignRuleResponse `json:"rules,omitempty"`
+	CreatedAt   time.Time              `json:"created_at"`
+	UpdatedAt   time.Time              `json:"updated_at"`
 }
 
 type CampaignRuleResponse struct {
-	ID             uuid.UUID               `json:"id"`
-	CampaignID     uuid.UUID               `json:"campaign_id"`
-	RuleType       string                  `json:"rule_type"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
-	CreatedAt      time.Time               `json:"created_at"`
-	UpdatedAt      time.Time               `json:"updated_at"`
+	ID             uuid.UUID          `json:"id"`
+	CampaignID     uuid.UUID          `json:"campaign_id"`
+	RuleType       string             `json:"rule_type"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
+	CreatedAt      time.Time          `json:"created_at"`
+	UpdatedAt      time.Time          `json:"updated_at"`
 }
 
 type ListCampaignsResponse struct {
@@ -138,11 +140,11 @@ type ListCampaignRulesResponse struct {
 
 // Helper structs
 type CampaignRuleStruct struct {
-	RuleType       string                  `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
+	RuleType       string             `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
 }
diff --git a/internal/entities/campaign.go b/internal/entities/campaign.go
index ea4c703..bf76ac5 100644
--- a/internal/entities/campaign.go
+++ b/internal/entities/campaign.go
@@ -45,18 +45,18 @@ const (
 )
 
 type Campaign struct {
-	ID          uuid.UUID               `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
-	Name        string                  `gorm:"type:varchar(150);not null" json:"name"`
-	Description *string                 `gorm:"type:text" json:"description,omitempty"`
-	Type        CampaignType            `gorm:"type:varchar(50);not null" json:"type"`
-	StartDate   time.Time               `gorm:"type:timestamp;not null" json:"start_date"`
-	EndDate     time.Time               `gorm:"type:timestamp;not null" json:"end_date"`
-	IsActive    bool                    `gorm:"type:boolean;default:true" json:"is_active"`
-	ShowOnApp   bool                    `gorm:"type:boolean;default:true" json:"show_on_app"`
-	Position    int                     `gorm:"type:int;default:0" json:"position"`
-	Metadata    *map[string]interface{} `gorm:"type:jsonb" json:"metadata,omitempty"`
-	CreatedAt   time.Time               `gorm:"type:timestamp;default:now()" json:"created_at"`
-	UpdatedAt   time.Time               `gorm:"type:timestamp;default:now()" json:"updated_at"`
+	ID          uuid.UUID    `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
+	Name        string       `gorm:"type:varchar(150);not null" json:"name"`
+	Description *string      `gorm:"type:text" json:"description,omitempty"`
+	Type        CampaignType `gorm:"type:varchar(50);not null" json:"type"`
+	StartDate   time.Time    `gorm:"type:timestamp;not null" json:"start_date"`
+	EndDate     time.Time    `gorm:"type:timestamp;not null" json:"end_date"`
+	IsActive    bool         `gorm:"type:boolean;default:true" json:"is_active"`
+	ShowOnApp   bool         `gorm:"type:boolean;default:true" json:"show_on_app"`
+	Position    int          `gorm:"type:int;default:0" json:"position"`
+	Metadata    *Metadata    `gorm:"type:jsonb" json:"metadata,omitempty"`
+	CreatedAt   time.Time    `gorm:"type:timestamp;default:now()" json:"created_at"`
+	UpdatedAt   time.Time    `gorm:"type:timestamp;default:now()" json:"updated_at"`
 
 	// Relations
 	Rules []CampaignRule `gorm:"foreignKey:CampaignID;constraint:OnDelete:CASCADE" json:"rules,omitempty"`
@@ -79,17 +79,17 @@ func (c *Campaign) BeforeUpdate(tx *gorm.DB) error {
 }
 
 type CampaignRule struct {
-	ID             uuid.UUID               `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
-	CampaignID     uuid.UUID               `gorm:"type:uuid;not null" json:"campaign_id"`
-	RuleType       RuleType                `gorm:"type:varchar(50);not null" json:"rule_type"`
-	ConditionValue *string                 `gorm:"type:varchar(255)" json:"condition_value,omitempty"`
-	RewardType     CampaignRewardType      `gorm:"type:varchar(50);not null" json:"reward_type"`
-	RewardValue    *int64                  `gorm:"type:bigint" json:"reward_value,omitempty"`
-	RewardSubtype  *RewardSubtype          `gorm:"type:varchar(50)" json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `gorm:"type:uuid" json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `gorm:"type:jsonb" json:"metadata,omitempty"`
-	CreatedAt      time.Time               `gorm:"type:timestamp;default:now()" json:"created_at"`
-	UpdatedAt      time.Time               `gorm:"type:timestamp;default:now()" json:"updated_at"`
+	ID             uuid.UUID          `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
+	CampaignID     uuid.UUID          `gorm:"type:uuid;not null" json:"campaign_id"`
+	RuleType       RuleType           `gorm:"type:varchar(50);not null" json:"rule_type"`
+	ConditionValue *string            `gorm:"type:varchar(255)" json:"condition_value,omitempty"`
+	RewardType     CampaignRewardType `gorm:"type:varchar(50);not null" json:"reward_type"`
+	RewardValue    *int64             `gorm:"type:bigint" json:"reward_value,omitempty"`
+	RewardSubtype  *RewardSubtype     `gorm:"type:varchar(50)" json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `gorm:"type:uuid" json:"reward_ref_id,omitempty"`
+	Metadata       *Metadata          `gorm:"type:jsonb" json:"metadata,omitempty"`
+	CreatedAt      time.Time          `gorm:"type:timestamp;default:now()" json:"created_at"`
+	UpdatedAt      time.Time          `gorm:"type:timestamp;default:now()" json:"updated_at"`
 
 	// Relations
 	Campaign Campaign `gorm:"foreignKey:CampaignID" json:"campaign,omitempty"`
diff --git a/internal/models/campaign.go b/internal/models/campaign.go
index da9a018..9c65dc6 100644
--- a/internal/models/campaign.go
+++ b/internal/models/campaign.go
@@ -3,34 +3,36 @@ package models
 import (
 	"time"
 
+	"apskel-pos-be/internal/entities"
+
 	"github.com/google/uuid"
 )
 
 type CreateCampaignRequest struct {
-	Name        string                  `json:"name" binding:"required,min=1,max=150"`
-	Description *string                 `json:"description,omitempty"`
-	Type        string                  `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
-	StartDate   time.Time               `json:"start_date" binding:"required"`
-	EndDate     time.Time               `json:"end_date" binding:"required"`
-	IsActive    bool                    `json:"is_active"`
-	ShowOnApp   bool                    `json:"show_on_app"`
-	Position    int                     `json:"position" binding:"min=0"`
-	Metadata    *map[string]interface{} `json:"metadata,omitempty"`
-	Rules       []CampaignRuleStruct    `json:"rules" binding:"required,min=1"`
+	Name        string               `json:"name" binding:"required,min=1,max=150"`
+	Description *string              `json:"description,omitempty"`
+	Type        string               `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
+	StartDate   time.Time            `json:"start_date" binding:"required"`
+	EndDate     time.Time            `json:"end_date" binding:"required"`
+	IsActive    bool                 `json:"is_active"`
+	ShowOnApp   bool                 `json:"show_on_app"`
+	Position    int                  `json:"position" binding:"min=0"`
+	Metadata    *entities.Metadata   `json:"metadata,omitempty"`
+	Rules       []CampaignRuleStruct `json:"rules" binding:"required,min=1"`
 }
 
 type UpdateCampaignRequest struct {
-	ID          uuid.UUID               `json:"id" binding:"required"`
-	Name        string                  `json:"name" binding:"required,min=1,max=150"`
-	Description *string                 `json:"description,omitempty"`
-	Type        string                  `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
-	StartDate   time.Time               `json:"start_date" binding:"required"`
-	EndDate     time.Time               `json:"end_date" binding:"required"`
-	IsActive    bool                    `json:"is_active"`
-	ShowOnApp   bool                    `json:"show_on_app"`
-	Position    int                     `json:"position" binding:"min=0"`
-	Metadata    *map[string]interface{} `json:"metadata,omitempty"`
-	Rules       []CampaignRuleStruct    `json:"rules" binding:"required,min=1"`
+	ID          uuid.UUID            `json:"id" binding:"required"`
+	Name        string               `json:"name" binding:"required,min=1,max=150"`
+	Description *string              `json:"description,omitempty"`
+	Type        string               `json:"type" binding:"required,oneof=REWARD POINTS TOKENS MIXED"`
+	StartDate   time.Time            `json:"start_date" binding:"required"`
+	EndDate     time.Time            `json:"end_date" binding:"required"`
+	IsActive    bool                 `json:"is_active"`
+	ShowOnApp   bool                 `json:"show_on_app"`
+	Position    int                  `json:"position" binding:"min=0"`
+	Metadata    *entities.Metadata   `json:"metadata,omitempty"`
+	Rules       []CampaignRuleStruct `json:"rules" binding:"required,min=1"`
 }
 
 type ListCampaignsRequest struct {
@@ -45,33 +47,33 @@ type ListCampaignsRequest struct {
 }
 
 type CampaignResponse struct {
-	ID          uuid.UUID               `json:"id"`
-	Name        string                  `json:"name"`
-	Description *string                 `json:"description,omitempty"`
-	Type        string                  `json:"type"`
-	StartDate   time.Time               `json:"start_date"`
-	EndDate     time.Time               `json:"end_date"`
-	IsActive    bool                    `json:"is_active"`
-	ShowOnApp   bool                    `json:"show_on_app"`
-	Position    int                     `json:"position"`
-	Metadata    *map[string]interface{} `json:"metadata,omitempty"`
-	Rules       []CampaignRuleResponse  `json:"rules,omitempty"`
-	CreatedAt   time.Time               `json:"created_at"`
-	UpdatedAt   time.Time               `json:"updated_at"`
+	ID          uuid.UUID              `json:"id"`
+	Name        string                 `json:"name"`
+	Description *string                `json:"description,omitempty"`
+	Type        string                 `json:"type"`
+	StartDate   time.Time              `json:"start_date"`
+	EndDate     time.Time              `json:"end_date"`
+	IsActive    bool                   `json:"is_active"`
+	ShowOnApp   bool                   `json:"show_on_app"`
+	Position    int                    `json:"position"`
+	Metadata    *entities.Metadata     `json:"metadata,omitempty"`
+	Rules       []CampaignRuleResponse `json:"rules,omitempty"`
+	CreatedAt   time.Time              `json:"created_at"`
+	UpdatedAt   time.Time              `json:"updated_at"`
 }
 
 type CampaignRuleResponse struct {
-	ID             uuid.UUID               `json:"id"`
-	CampaignID     uuid.UUID               `json:"campaign_id"`
-	RuleType       string                  `json:"rule_type"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
-	CreatedAt      time.Time               `json:"created_at"`
-	UpdatedAt      time.Time               `json:"updated_at"`
+	ID             uuid.UUID          `json:"id"`
+	CampaignID     uuid.UUID          `json:"campaign_id"`
+	RuleType       string             `json:"rule_type"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
+	CreatedAt      time.Time          `json:"created_at"`
+	UpdatedAt      time.Time          `json:"updated_at"`
 }
 
 type ListCampaignsResponse struct {
@@ -83,26 +85,26 @@ type ListCampaignsResponse struct {
 
 // Campaign Rule Models
 type CreateCampaignRuleRequest struct {
-	CampaignID     uuid.UUID               `json:"campaign_id" binding:"required"`
-	RuleType       string                  `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
+	CampaignID     uuid.UUID          `json:"campaign_id" binding:"required"`
+	RuleType       string             `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
 }
 
 type UpdateCampaignRuleRequest struct {
-	ID             uuid.UUID               `json:"id" binding:"required"`
-	CampaignID     uuid.UUID               `json:"campaign_id" binding:"required"`
-	RuleType       string                  `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
+	ID             uuid.UUID          `json:"id" binding:"required"`
+	CampaignID     uuid.UUID          `json:"campaign_id" binding:"required"`
+	RuleType       string             `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
 }
 
 type ListCampaignRulesRequest struct {
@@ -122,11 +124,11 @@ type ListCampaignRulesResponse struct {
 
 // Helper structs
 type CampaignRuleStruct struct {
-	RuleType       string                  `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
-	ConditionValue *string                 `json:"condition_value,omitempty"`
-	RewardType     string                  `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
-	RewardValue    *int64                  `json:"reward_value,omitempty"`
-	RewardSubtype  *string                 `json:"reward_subtype,omitempty"`
-	RewardRefID    *uuid.UUID              `json:"reward_ref_id,omitempty"`
-	Metadata       *map[string]interface{} `json:"metadata,omitempty"`
+	RuleType       string             `json:"rule_type" binding:"required,oneof=TIER SPEND PRODUCT CATEGORY DAY LOCATION"`
+	ConditionValue *string            `json:"condition_value,omitempty"`
+	RewardType     string             `json:"reward_type" binding:"required,oneof=POINTS TOKENS REWARD"`
+	RewardValue    *int64             `json:"reward_value,omitempty"`
+	RewardSubtype  *string            `json:"reward_subtype,omitempty"`
+	RewardRefID    *uuid.UUID         `json:"reward_ref_id,omitempty"`
+	Metadata       *entities.Metadata `json:"metadata,omitempty"`
 }