gistfile1.txt

my payload:

{
  is_demo: true,
  intent: 'sale',
  contract: { id: 'GCR_3HF0EBJ8CHXM67H76MJDMP99W02AOX' },
  customer: {
    contact: {
      forename: 'acc1_adi',
      surname: 'acc1_adi',
      address: {
        street: 'ajoptjp  CORPO',
        street_number: undefined,
        postal_code: '8194',
        city: 'city',
        country: 'CL'
      },
      email: 'adam.leszczynsky@gmail.com'
    }
  },
  basket: {
    products: [
      {
        item_type: 'sub_transaction',
        desc: '2704 Mint API test 1',
        reference_id: 'nftID_1005 — listingID_1069 — userID_123 — acc1_adi — orderID_2590 — 5.829650583165766',
        contract_id: 'GCR_6RDP7T7B49AKWK0S89J45GP9W083OH',
        sum: 600,
        sub_basket: [
          {
            id: 10051069110,
            item_type: 'article',
            quantity: 1,
            desc: '2704 Mint API test 1',
            priceOne: 600,
            tax: 19,
            reference_id: 'nftID_1005 — userID_123 — acc1_adi — orderID_2590 — 6.928935450649043'
          },
          {
            item_type: 'stakeholder_payment',
            desc: 'platform',
            sum: 594,
            contract_id: 'GCR_3HF0EBJ8CHXM67H76MJDMP99W02AOX',
            reference_id: 'platform fee 0 — nftID_1005 — listingID_1069 — for GCR_3HF0EBJ8CHXM67H76MJDMP99W02AOX — userID_123 — acc1_adi — orderID_2590 — 7.50683652441849'
          }
        ]
      }
    ]
  },
  basket_info: { currency: 'EUR', sum: 600 },
  transactionRef: 'Purchase of NFT#2590',
  payment_context: { auto_capture: true, merchant_initiated: false },
  application_context: {
    language: 'en',
    checkout_template: 'COT_WD0DE66HN2XWJHW8JM88003YG0NEA2',
    return_urls: {
      url_success: 'http://localhost:3000/profile/orders/2590?secupayPayment=success',
      url_error: 'http://localhost:3000/profile/orders/2590?secupayPayment=error',
      url_abort: 'http://localhost:3000/profile/orders/2590?secupayAbort=error'
    }
  }
}

your server response:

{
  status: 'error',
  error: 'ProductInternalException',
  error_details: 'Internal error',
  error_user: 'Es ist ein unbekannter Fehler aufgetreten',
  code: 0,
  supportId: '9a729f9af66e3cbf213df159af22cd1a'
}