intento con category playa
{
  "id": 21875497,
  "qr": {
    "image": "https://www.mercadopago.com/instore/merchant/qr/21875497/bffbb6422ba348ffae9bed7f6d77f408e2e7bca790e54057a49e8b0c2589b711.png",
    "template_document": "https://www.mercadopago.com/instore/merchant/qr/21875497/template_bffbb6422ba348ffae9bed7f6d77f408e2e7bca790e54057a49e8b0c2589b711.pdf",
    "template_image": "https://www.mercadopago.com/instore/merchant/qr/21875497/template_bffbb6422ba348ffae9bed7f6d77f408e2e7bca790e54057a49e8b0c2589b711.png"
  },
  "status": "active",
  "date_created": "2021-03-30T09:02:27.000-04:00",
  "date_last_updated": "2021-03-30T09:02:27.000-04:00",
  "uuid": "bffbb6422ba348ffae9bed7f6d77f408e2e7bca790e54057a49e8b0c2589b711",
  "user_id": 32526765,
  "name": "Caja Principal Boxes",
  "fixed_amount": true,
  "category": 473000,
  "store_id": "34622049",
  "external_store_id": "STORE001",
  "url": "http://wpsoftcomar.ipower.com/recibir.php?st=29&est=09",
  "external_id": "st029",
  "site": "MLA",
  "qr_code": "00020101021143530016com.mercadolibre0129https://mpago.la/pos/2187549750150011201634395155204970053030325802AR5913RAFAEL IACONO6011BERAZATEGUI6304B34D"
}

intento con category shop
{
  "id": 21908940,
  "qr": {
    "image": "https://www.mercadopago.com/instore/merchant/qr/21908940/a1df636e2bdb4e58aa2ae6532b4d9dfd0b80c738d4df44f19dd1bcfab1305b47.png",
    "template_document": "https://www.mercadopago.com/instore/merchant/qr/21908940/template_a1df636e2bdb4e58aa2ae6532b4d9dfd0b80c738d4df44f19dd1bcfab1305b47.pdf",
    "template_image": "https://www.mercadopago.com/instore/merchant/qr/21908940/template_a1df636e2bdb4e58aa2ae6532b4d9dfd0b80c738d4df44f19dd1bcfab1305b47.png"
  },
  "status": "active",
  "date_created": "2021-03-31T09:24:37.000-04:00",
  "date_last_updated": "2021-03-31T09:24:37.000-04:00",
  "uuid": "a1df636e2bdb4e58aa2ae6532b4d9dfd0b80c738d4df44f19dd1bcfab1305b47",
  "user_id": 32526765,
  "name": "Caja Principal Boxes",
  "fixed_amount": true,
  "category": 621102,
  "store_id": "34622049",
  "external_store_id": "STORE001",
  "url": "http://wpsoftcomar.ipower.com/recibir.php?st=28&est=09",
  "external_id": "st028",
  "site": "MLA",
  "qr_code": "00020101021143530016com.mercadolibre0129https://mpago.la/pos/2190894050150011201634395155204970053030325802AR5913RAFAEL IACONO6011BERAZATEGUI63047B31"
}