CMSG_BUY_ITEM

Client Version 1, Client Version 2

cmsg CMSG_BUY_ITEM = 0x01A2 {
    Guid vendor;
    Item item;
    u8 amount;
    u8 unknown1;
}

CMSG have a header of 6 bytes.

Offset	Size / Endianness	Type	Name	Description
0x00	2 / Big	uint16	size	Size of the rest of the message including the opcode field but not including the size field.
0x02	4 / Little	uint32	opcode	Opcode that determines which fields the message contains.

Offset	Size / Endianness	Type	Name	Comment
0x06	8 / Little	Guid	vendor
0x0E	4 / Little	Item	item
0x12	1 / -	u8	amount
0x13	1 / -	u8	unknown1	cmangos says this is hardcoded to 1 in the TBC client.

cmsg CMSG_BUY_ITEM = 0x01A2 {
    Guid vendor;
    Item item;
    u32 slot;
    u8 amount;
}

CMSG have a header of 6 bytes.

Offset	Size / Endianness	Type	Name	Description
0x00	2 / Big	uint16	size	Size of the rest of the message including the opcode field but not including the size field.
0x02	4 / Little	uint32	opcode	Opcode that determines which fields the message contains.

Offset	Size / Endianness	Type	Name
0x06	8 / Little	Guid	vendor
0x0E	4 / Little	Item	item
0x12	4 / Little	u32	slot
0x16	1 / -	u8	amount