Send Template Message

//native

export type DynSelect_template_name = string

// Resolver: lists the WABA's approved message templates for the dropdown.

export async function template_name(auth: RT.WhatsappBusiness) {

  const apiVersion = auth.api_version || "v25.0"

  const r = await fetch(

    `https://graph.facebook.com/${apiVersion}/${auth.business_account_id}/message_templates?fields=name,language,status&limit=100`,

    {

      headers: {

        Authorization: `Bearer ${auth.token}`,

        Accept: "application/json",

      },

    }

  )

  const { data } = (await r.json()) as {

    data: { name: string; language: string; status: string }[]

  }

  return (data ?? []).map((t) => ({

    value: t.name,

    label: `${t.name} (${t.language}, ${t.status})`,

  }))

}

/**

 * Send Template Message

 * Send a pre-approved template message to a WhatsApp user. Templates are required to start conversations outside the 24-hour customer service window.

 */

export async function main(

  auth: RT.WhatsappBusiness,

  to: string,

  template_name: DynSelect_template_name,

  language: string,

  components: { [key: string]: any }[] | undefined

) {

  const apiVersion = auth.api_version || "v25.0"

  const url = new URL(

    `https://graph.facebook.com/${apiVersion}/${auth.phone_number_id}/messages`

  )

  const template: { [key: string]: any } = {

    name: template_name,

    language: { code: language },

  }

  if (components !== undefined && components.length > 0) {

    template.components = components

  }

  const response = await fetch(url, {

    method: "POST",

    headers: {

      Authorization: `Bearer ${auth.token}`,

      "Content-Type": "application/json",

      Accept: "application/json",

    },

    body: JSON.stringify({

      messaging_product: "whatsapp",

      recipient_type: "individual",

      to,

      type: "template",

      template,

    }),

  })

  if (!response.ok) {

    throw new Error(`${response.status} ${await response.text()}`)

  }

  return await response.json()

}