I want to call an external api which needs bearer token as authorization. I have created controller and service using 'lb4 openapi' command. I couldn't find direct way to send header.

this is interface for external service which needs a param:

export interface MerchantService {
  /**
   * @param partnerId 
   * @returns OK
   */
  getMerchantDetails(partnerId: string): Promise<MerchantResponse>;

}

i'm calling this from another service like this:

let merchantDetails = await this.merchantService.getMerchantDetails(partner_id)

now i want to pass one bearer authorization token to this api also, how can i pass that.