Provide evidence

//native

type Paypal = {

  clientId: string;

  clientSecret: string;

};

type Base64 = string;

async function getToken(auth: Paypal): Promise<string> {

  const url = new URL(`https://api-m.paypal.com/v1/oauth2/token`);

  const response = await fetch(url, {

    method: "POST",

    headers: {

      Authorization: `Basic ${btoa(`${auth.clientId}:${auth.clientSecret}`)}`,

    },

    body: new URLSearchParams({

      grant_type: "client_credentials",

    }),

  });

  if (!response.ok) {

    const text = await response.text();

    throw new Error(`Could not get token: ${response.status} ${text}`);

  }

  const json = await response.json();

  return json.access_token;

}

/**

 * Provide evidence

 * Provides evidence for a dispute, by ID.

 */

export async function main(

  auth: Paypal,

  id: string,

  body: {

    "evidence-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;

    };

  }

) {

  const token = await getToken(auth);

  const url = new URL(

    `https://api-m.paypal.com/v1/customer/disputes/${id}/provide-evidence`

  );

  const formData = new FormData();

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

    if (v !== undefined) {

      if (["evidence-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 " + token,

    },

    body: formData,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}