Revise plan or quantity of subscription

//native

type Paypal = {

  clientId: string;

  clientSecret: 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;

}

/**

 * Revise plan or quantity of subscription

 * Updates the quantity of the product or service in a subscription. You can also use this method to switch the plan and update the `shipping_amount`, `shipping_address` values for the subscription. This type of update requires the buyer's consent.

 */

export async function main(

  auth: Paypal,

  id: string,

  body: {

    plan_id?: string;

    quantity?: string;

    shipping_amount?: { currency_code: string; value: string };

    shipping_address?: {

      name?: {

        prefix?: string;

        given_name?: string;

        surname?: string;

        middle_name?: string;

        suffix?: string;

        alternate_full_name?: string;

        full_name?: string;

      };

      type?: "SHIPPING" | "PICKUP_IN_PERSON";

      address?: {

        address_line_1?: string;

        address_line_2?: string;

        address_line_3?: string;

        admin_area_4?: string;

        admin_area_3?: string;

        admin_area_2?: string;

        admin_area_1?: string;

        postal_code?: string;

        country_code: string;

        address_details?: {

          street_number?: string;

          street_name?: string;

          street_type?: string;

          delivery_service?: string;

          building_name?: string;

          sub_building?: string;

        };

      };

    };

    application_context?: {

      brand_name?: string;

      locale?: string;

      shipping_preference?:

        | "GET_FROM_FILE"

        | "NO_SHIPPING"

        | "SET_PROVIDED_ADDRESS";

      user_action?: "CONTINUE" | "SUBSCRIBE_NOW";

      payment_method?: {

        payer_selected?: string;

        payee_preferred?: "UNRESTRICTED" | "IMMEDIATE_PAYMENT_REQUIRED";

        standard_entry_class_code?: "TEL" | "WEB" | "CCD" | "PPD";

      };

      return_url: string;

      cancel_url: string;

    };

    plan?: {

      billing_cycles?: {

        pricing_scheme?: {

          version?: number;

          fixed_price?: { currency_code: string; value: string };

          pricing_model?: "VOLUME" | "TIERED";

          tiers?: {

            starting_quantity: string;

            ending_quantity?: string;

            amount: { currency_code: string; value: string };

          }[];

          create_time?: string;

          update_time?: string;

        };

        sequence: number;

        total_cycles?: number;

      }[];

      payment_preferences?: {

        auto_bill_outstanding?: false | true;

        setup_fee?: { currency_code: string; value: string };

        setup_fee_failure_action?: "CONTINUE" | "CANCEL";

        payment_failure_threshold?: number;

      };

      taxes?: { percentage?: string; inclusive?: false | true };

    };

  },

) {

  const token = await getToken(auth);

  const url = new URL(

    `https://api-m.paypal.com/v1/billing/subscriptions/${id}/revise`,

  );

  const response = await fetch(url, {

    method: "POST",

    headers: {

      "Content-Type": "application/json",

      Authorization: "Bearer " + token,

    },

    body: JSON.stringify(body),

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.json();

}