curl --request GET \
  --url https://api.withflex.com/v1/payment_links \
  --header 'Authorization: Bearer <token>'

{
  "payment_links": [
    {
      "payment_link_id": "<string>",
      "label": "<string>",
      "active": true,
      "line_items": [
        {
          "price": "<string>",
          "price_data": {
            "description": "<string>",
            "product": "<string>",
            "unit_amount": 1,
            "recurring": {
              "interval": "daily",
              "interval_count": 1,
              "trial_period_days": 1
            },
            "metadata": {}
          },
          "quantity": 123,
          "shipping_options": {
            "shipping_rate_id": "<string>",
            "shipping_rate_data": {
              "display_name": "<string>",
              "amount": 123,
              "metadata": {}
            }
          }
        }
      ],
      "allow_promotion_codes": true,
      "shipping_address_collection": true,
      "shipping_options": {
        "shipping_rate_id": "<string>",
        "shipping_amount": 123
      },
      "metadata": {},
      "url": "<string>",
      "created_at": "<string>",
      "payment_intent_data": {
        "capture_method": "automatic",
        "metadata": {}
      },
      "after_completion": {
        "type": "redirect",
        "hosted_confirmation": {
          "custom_message": "<string>"
        },
        "redirect": {
          "url": "<string>"
        }
      },
      "origin": "shopify",
      "test_mode": true
    }
  ]
}