А почему бы вам не установить курсор на "SendMessageParams" и не нажать правой кнопкой мыши на этом слове, да и не перейти к объявлению типа, чтобы просто посмотреть, а какие же там поля требуются в этой структуре?
И, странное дело, нет такого поля ReplyToMessageID у типа SendMessageParams, о чём вам прямо и говорит компилятор.
Документация и исходный код - вот источник правды, а не устаревшие туториалы школьников на ютубчике.
// SendMessageParams - Represents parameters of sendMessage method.
type SendMessageParams struct {
// BusinessConnectionID - Optional. Unique identifier of the business connection on behalf of which the
// message will be sent
BusinessConnectionID string `json:"business_connection_id,omitempty"`
// ChatID - Unique identifier for the target chat or username of the target channel (in the format
// @channel_username)
ChatID ChatID `json:"chat_id"`
// MessageThreadID - Optional. Unique identifier for the target message thread (topic) of the forum; for
// forum supergroups only
MessageThreadID int `json:"message_thread_id,omitempty"`
// Text - Text of the message to be sent, 1-4096 characters after entities parsing
Text string `json:"text"`
// ParseMode - Optional. Mode for parsing entities in the message text. See formatting options
// (https://core.telegram.org/bots/api#formatting-options) for more details.
ParseMode string `json:"parse_mode,omitempty"`
// Entities - Optional. A JSON-serialized list of special entities that appear in message text, which can be
// specified instead of parse_mode
Entities []MessageEntity `json:"entities,omitempty"`
// LinkPreviewOptions - Optional. Link preview generation options for the message
LinkPreviewOptions *LinkPreviewOptions `json:"link_preview_options,omitempty"`
// DisableNotification - Optional. Sends the message silently
// (https://telegram.org/blog/channels-2-0#silent-messages). Users will receive a notification with no sound.
DisableNotification bool `json:"disable_notification,omitempty"`
// ProtectContent - Optional. Protects the contents of the sent message from forwarding and saving
ProtectContent bool `json:"protect_content,omitempty"`
// MessageEffectID - Optional. Unique identifier of the message effect to be added to the message; for
// private chats only
MessageEffectID string `json:"message_effect_id,omitempty"`
// ReplyParameters - Optional. Description of the message to reply to
ReplyParameters *ReplyParameters `json:"reply_parameters,omitempty"`
// ReplyMarkup - Optional. Additional interface options. A JSON-serialized object for an inline keyboard
// (https://core.telegram.org/bots/features#inline-keyboards), custom reply keyboard
// (https://core.telegram.org/bots/features#keyboards), instructions to remove a reply keyboard or to force a
// reply from the user
ReplyMarkup ReplyMarkup `json:"reply_markup,omitempty"`
}
А если точно так же перейти к определению типа поля ReplyParameters, то можно увидеть как раз то самое искомое вами поле MessageID
// ReplyParameters - Describes reply parameters for the message that is being sent.
type ReplyParameters struct {
// MessageID - Identifier of the message that will be replied to in the current chat, or in the chat chat_id
// if it is specified
MessageID int `json:"message_id"`
// ChatID - Optional. If the message to be replied to is from a different chat, unique identifier for the
// chat or username of the channel (in the format @channel_username). Not supported for messages sent on behalf
// of a business account.
ChatID ChatID `json:"chat_id,omitempty"`
// AllowSendingWithoutReply - Optional. Pass True if the message should be sent even if the specified
// message to be replied to is not found. Always False for replies in another chat or forum topic. Always True
// for messages sent on behalf of a business account.
AllowSendingWithoutReply bool `json:"allow_sending_without_reply,omitempty"`
// Quote - Optional. Quoted part of the message to be replied to; 0-1024 characters after entities parsing.
// The quote must be an exact substring of the message to be replied to, including bold, italic, underline,
// strikethrough, spoiler, and custom_emoji entities. The message will fail to send if the quote isn't found in
// the original message.
Quote string `json:"quote,omitempty"`
// QuoteParseMode - Optional. Mode for parsing entities in the quote. See formatting options
// (https://core.telegram.org/bots/api#formatting-options) for more details.
QuoteParseMode string `json:"quote_parse_mode,omitempty"`
// QuoteEntities - Optional. A JSON-serialized list of special entities that appear in the quote. It can be
// specified instead of quote_parse_mode.
QuoteEntities []MessageEntity `json:"quote_entities,omitempty"`
// QuotePosition - Optional. Position of the quote in the original message in UTF-16 code units
QuotePosition int `json:"quote_position,omitempty"`
}
Итого, в вашем случае будет как-то так:
id, ticket, reply_message := db.GetTicketAndMessage(message.ReplyToMessage.MessageID, user.ID)
if ticket == nil {
_, _ = bot.SendMessage(&telego.SendMessageParams{
ChatID: telego.ChatID{ID: message.Chat.ID},
Text: "This ticket or message does not exist.",
ReplyParameters: &telego.ReplyParameters{
MessageID: message.MessageID
},
ParseMode: "HTML",
})
return
}