type Stripe = {

  token: string;

};

type Base64 = string;

/**

 * Post files

 * To upload a file to Stripe, you need to send a request of type multipart/form-data. Include the file you want to upload in the request, and the parameters for creating a file.

All of Stripe’s officially supported Client libraries support sending multipart/form-data.

 */

export async function main(

  auth: Stripe,

  body: {

    expand?: string[];

    file: {

      base64: Base64;

      type:

        | "image/png"

        | "image/jpeg"

        | "image/gif"

        | "application/pdf"

        | "appication/json"

        | "text/csv"

        | "text/plain"

        | "audio/mpeg"

        | "audio/wav"

        | "video/mp4";

      name: string;

    };

    file_link_data?: {

      create: boolean;

      expires_at?: number;

      metadata?: { [k: string]: string } | "";

      [k: string]: unknown;

    };

    purpose:

      | "account_requirement"

      | "additional_verification"

      | "business_icon"

      | "business_logo"

      | "customer_signature"

      | "dispute_evidence"

      | "identity_document"

      | "pci_document"

      | "tax_document_user_upload"

      | "terminal_reader_splashscreen";

  }

) {

  const url = new URL(`https://api.stripe.com/v1/files`);

  const formData = new FormData();

  for (const [k, v] of Object.entries(body)) {

    if (v !== undefined && v !== "") {

      if (["file"].includes(k)) {

        const { base64, type, name } = v as {

          base64: Base64;

          type: string;

          name: string;

        };

        formData.append(

          k,

          new Blob([Uint8Array.from(atob(base64), (m) => m.codePointAt(0)!)], {

            type,

          }),

          name

        );

      } else {

        formData.append(k, String(v));

      }

    }

  }

  const response = await fetch(url, {

    method: "POST",

    headers: {

      Authorization: "Bearer " + auth.token,

    },

    body: formData,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}