fix: Leave payload as byte array instead of coverting to int array

x/gmp/keeper/keeper.go

@@ -146,16 +146,12 @@ func (k Keeper) BuildGmpRequest(
 	if err != nil {
 		return nil, err
 	}
-	intPayload := make([]int, len(payload))
-	for i, b := range payload {
-		intPayload[i] = int(b)
-	}
 
 	// package GMP
 	message := types.GmpMessage{
 		DestinationChain:   msg.DestinationChain,
 		DestinationAddress: msg.OjoContractAddress,
-		Payload:            intPayload,
+		Payload:            payload,
 		Type:               types.TypeGeneralMessage,
 		Fee: &types.GmpFee{
 			Amount:    msg.Token.Amount.String(),

x/gmp/types/gmp_message.go

@@ -10,7 +10,7 @@ type GmpMessage struct {
 	// DestinationAddress is the destination address of the message
 	DestinationAddress string `json:"destination_address"`
 	// Payload is the encoded payload of the message (exchange rates)
-	Payload []int `json:"payload"`
+	Payload []byte `json:"payload"`
 	// Type is an enum that specifies the type of message
 	Type int64 `json:"type"`
 	// Fee is the fee paid to a relayer on the Axelar network

x/gmp/types/gmp_message_test.go

@@ -39,15 +39,11 @@ func TestUnmarshalIntoAxelarMessage(t *testing.T) {
 	)
 	payload, err := encoder.GMPEncode()
 	require.NoError(t, err)
-	intPayload := make([]int, len(payload))
-	for i, b := range payload {
-		intPayload[i] = int(b)
-	}
 
 	message := GmpMessage{
 		DestinationChain:   "base",
 		DestinationAddress: "0xa97Abf29D45DEDD18612f181383fC127da1cAa8d",
-		Payload:            intPayload,
+		Payload:            payload,
 		Type:               1,
 		Fee: &GmpFee{
 			Amount:    "100000000000",