Method 3) Custom method

This method allows you provide a callback using which you can send emails however you like. The input to the callback will be email template variables, so you can freely design the email as well. Use this method if you are:

Using a third party email service like Mailchimp.
You want to do some custom spam protection before sending the email.
You already have an email sending infrastructure and want to use that.

NodeJS
GoLang
Python

import supertokens from "supertokens-node";
import Passwordless from "supertokens-node/recipe/passwordless";
import Session from "supertokens-node/recipe/session";

supertokens.init({
    appInfo: {
        apiDomain: "...",
        appName: "...",
        websiteDomain: "..."
    },
    recipeList: [
        Passwordless.init({
            emailDelivery: {
                override: (originalImplementation) => {
                    return {
                        ...originalImplementation,
                        sendEmail: async function ({
                            codeLifetime, // amount of time the code is alive for (in MS)
                            email,
                            urlWithLinkCode, // magic link
                            userInputCode, // OTP
                        }) {
                            // TODO: create and send email
                        }
                    }
                }
            },
        }),
        Session.init()
    ]
});


import (
    "fmt"

    "github.com/supertokens/supertokens-golang/ingredients/emaildelivery"
    "github.com/supertokens/supertokens-golang/recipe/passwordless"
    "github.com/supertokens/supertokens-golang/recipe/passwordless/plessmodels"
    "github.com/supertokens/supertokens-golang/supertokens"
)

func main() {
    supertokens.Init(supertokens.TypeInput{
        RecipeList: []supertokens.Recipe{
            passwordless.Init(plessmodels.TypeInput{
                EmailDelivery: &emaildelivery.TypeInput{
                    Override: func(originalImplementation emaildelivery.EmailDeliveryInterface) emaildelivery.EmailDeliveryInterface {

                        (*originalImplementation.SendEmail) = func(input emaildelivery.EmailType, userContext supertokens.UserContext) error {
                            // amount of time the code is alive for (in MS)
                            codeLifetime := input.PasswordlessLogin.CodeLifetime
                            email := input.PasswordlessLogin.Email

                            // magic link
                            urlWithLinkCode := input.PasswordlessLogin.UrlWithLinkCode

                            // OTP
                            userInputCode := input.PasswordlessLogin.UserInputCode
                            fmt.Println(codeLifetime)
                            fmt.Println(email)
                            fmt.Println(urlWithLinkCode)
                            fmt.Println(userInputCode)
                            // TODO: create and send email
                            return nil
                        }

                        return originalImplementation
                    },
                },
            }),
        },
    })
}

from supertokens_python import init, InputAppInfo
from supertokens_python.recipe.passwordless.types import EmailDeliveryOverrideInput, EmailTemplateVars
from supertokens_python.recipe import passwordless
from typing import Dict, Any
from supertokens_python.ingredients.emaildelivery.types import EmailDeliveryConfig


def custom_email_deliver(original_implementation: EmailDeliveryOverrideInput) -> EmailDeliveryOverrideInput:
    async def send_email(template_vars: EmailTemplateVars, user_context: Dict[str, Any]) -> None:
        # amount of time the code is alive for (in MS)
        _ = template_vars.code_life_time
        __ = template_vars.email
        ___ = template_vars.url_with_link_code  # magic link
        ____ = template_vars.user_input_code  # OTP

        # TODO: create and send email...
    original_implementation.send_email = send_email
    return original_implementation

init(
    app_info=InputAppInfo(
        api_domain="...", app_name="...", website_domain="..."),
    framework='...',  
    recipe_list=[
        passwordless.init(
            email_delivery=EmailDeliveryConfig(override=custom_email_deliver)
        )
    ]
)

If you call the original implementation function for sendEmail, it will use the service that you have configured. If you have not configured any service, it will use the default service.

important

When using this callback, you must manage sending the email yourself.