/** File payload for Gate multipart/form-data OTC endpoints */
export type GateMultipartFile = Blob | Buffer | {
    filename?: string;
    content: Blob | Buffer;
};
export declare function appendGateMultipartFile(form: FormData, fieldName: string, file: GateMultipartFile): void;
export declare function appendGateMultipartFields(form: FormData, fields: Record<string, string | undefined>): void;