diff --git a/backend/main.go b/backend/main.go
index 723ccbd..42b6beb 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -304,6 +304,12 @@ func App() *cli.App {
 						Usage:    "Path to HTML body file",
 						Required: true,
 					},
+					&cli.StringFlag{
+						Name:     "ics-body",
+						Value:    "",
+						Usage:    "Path to ICS body file",
+						Required: true,
+					},
 					&cli.StringFlag{
 						Name:     "recipients",
 						Value:    "",
@@ -316,8 +322,8 @@ func App() *cli.App {
 						Required: false,
 					},
 				},
-				Usage:     "blast-email [subject] [template-plaintext] [template-html-body] [csv-file list destination of emails]",
-				ArgsUsage: "[subject] [template-plaintext] [template-html-body] [path-csv-file]",
+				Usage:     "blast-email [subject] [template-plaintext] [template-html-body] [attachment-ics-body] [csv-file list destination of emails]",
+				ArgsUsage: "[subject] [template-plaintext] [template-html-body] [attachment-ics-body] [path-csv-file]",
 				Action: func(cCtx *cli.Context) error {
 					config, err := GetConfig(cCtx.String("config-file-path"))
 					if err != nil {
@@ -349,6 +355,7 @@ func App() *cli.App {
 					htmlBody := cCtx.String("html-body")
 					mailCsv := cCtx.String("recipients")
 					singleRecipient := cCtx.String("single-recipient")
+					icsBody := cCtx.String("ics-body")
 
 					if subject == "" {
 						log.Fatal().Msg("Subject is required")
@@ -401,6 +408,14 @@ func App() *cli.App {
 						})
 					}
 
+					var icsContent []byte
+					if icsBody != "" {
+						icsContent, err = os.ReadFile(icsBody)
+						if err != nil {
+							log.Fatal().Err(err).Msg("failed to read ics attachment")
+						}
+					}
+
 					mailSender := NewMailSender(&MailConfiguration{
 						SmtpHostname: config.Mailer.Hostname,
 						SmtpPort:     config.Mailer.Port,
@@ -408,6 +423,17 @@ func App() *cli.App {
 						SmtpPassword: config.Mailer.Password,
 					})
 
+					attachments := []Attachment{}
+					if icsContent != nil {
+						attachments = append(attachments, Attachment{
+							ContentDisposition: ContentDispositionAttachment,
+							Name:               "invite.ics",
+							Description:        "Invitation",
+							ContentType:        "application/ics",
+							Payload:            icsContent,
+						})
+					}
+
 					for _, user := range userList {
 						mail := &Mail{
 							RecipientName:  user.Name,
@@ -415,6 +441,7 @@ func App() *cli.App {
 							Subject:        subject,
 							PlainTextBody:  string(plaintextContent),
 							HtmlBody:       string(htmlContent),
+							Attachments:    attachments,
 						}
 
 						// Parse email template information
diff --git a/emails/payment_success.ics b/emails/payment_success.ics
new file mode 100644
index 0000000..be8b08d
--- /dev/null
+++ b/emails/payment_success.ics
@@ -0,0 +1,26 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//conf.teknologiumum.com//Teknologi Umum
+CALSCALE:GREGORIAN
+BEGIN:VTIMEZONE
+TZID:Asia/Jakarta
+LAST-MODIFIED:20230407T050750Z
+TZURL:https://www.tzurl.org/zoneinfo-outlook/Asia/Jakarta
+X-LIC-LOCATION:Asia/Jakarta
+BEGIN:STANDARD
+TZNAME:WIB
+TZOFFSETFROM:+0700
+TZOFFSETTO:+0700
+DTSTART:19700101T000000
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+DTSTAMP:20231015T085408Z
+UID:20231015T085408Z@teknologiumum.com
+DTSTART;TZID=Asia/Jakarta:20231021T130000
+DTEND;TZID=Asia/Jakarta:20231021T190000
+SUMMARY:TeknumConf 2023
+URL:https://conf.teknologiumum.com/
+LOCATION:Kode Creative Hub\, Depok Town Square Depok\, Indonesia
+END:VEVENT
+END:VCALENDAR
\ No newline at end of file