Type 'MyProvider' is not assignable to type 'ISmsProvider'

export class CustomSnppSmsProvider implements ISmsProvider {
  id = 'customsnpp';
  channelType = ChannelTypeEnum.SMS as ChannelTypeEnum.SMS;

  constructor(
    private config: {
      host: string;
      port: number;
      username: string;
      password: string;
    }
  ) {
    this.config = config;
  }

  async sendMessage(
    options: ISmsOptions
  ): Promise<ISendMessageSuccessResponse> {
    const client = new net.Socket();
    let responseCode = '';

......

export class CustomSnppSmsProvider implements ISmsProvider {
  id = 'customsnpp';
  channelType = ChannelTypeEnum.SMS as ChannelTypeEnum.SMS;

  constructor(
    private config: {
      host: string;
      port: number;
      username: string;
      password: string;
    }
  ) {
    this.config = config;
  }

  async sendMessage(
    options: ISmsOptions
  ): Promise<ISendMessageSuccessResponse> {
    const client = new net.Socket();
    let responseCode = '';

......

export class CustomSnppHandler extends BaseSmsHandler {
  constructor() {
    super('customsnpp', ChannelTypeEnum.SMS);
  }

  buildProvider(credentials: ICredentials) {
    const config: {
      host: string;
      port: number;
      username: string;
      password: string;
    } = {
      host: credentials.host,
      port: +credentials.port,
      username: credentials.user,
      password: credentials.password,
    };

    this.provider = new CustomSnppSmsProvider(config);
  }
}

export class CustomSnppHandler extends BaseSmsHandler {
  constructor() {
    super('customsnpp', ChannelTypeEnum.SMS);
  }

  buildProvider(credentials: ICredentials) {
    const config: {
      host: string;
      port: number;
      username: string;
      password: string;
    } = {
      host: credentials.host,
      port: +credentials.port,
      username: credentials.user,
      password: credentials.password,
    };

    this.provider = new CustomSnppSmsProvider(config);
  }
}