NewNewsletterService (usecase/newsletter.go)

Service to manage WhatsApp newsletter actions like unfollow, fetch messages, and download media.

// Source: https://github.com/aldinokemal/go-whatsapp-web-multidevice | License: MIT
// Provided via justclaw.it.com; keep this notice with the code.
package usecase

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/aldinokemal/go-whatsapp-web-multidevice/config"
	domainNewsletter "github.com/aldinokemal/go-whatsapp-web-multidevice/domains/newsletter"
	"github.com/aldinokemal/go-whatsapp-web-multidevice/infrastructure/whatsapp"
	pkgError "github.com/aldinokemal/go-whatsapp-web-multidevice/pkg/error"
	"github.com/aldinokemal/go-whatsapp-web-multidevice/pkg/utils"
	"github.com/aldinokemal/go-whatsapp-web-multidevice/validations"
	"github.com/sirupsen/logrus"
	"go.mau.fi/whatsmeow"
	"go.mau.fi/whatsmeow/proto/waE2E"
	"go.mau.fi/whatsmeow/types"
)

type serviceNewsletter

... (truncated -- full source via MCP)