Cart API: cart.data.data.cart_amount is not calculated correctly.... I think - bigcommerce

Question

added a product to cart using API price was $29
GET /v3/carts/cartId saw cart_amount was correct
changed product price to $100
GET /v3/carts/cartId saw cart_amount was wrong — it did not see that the product price had changed.
Am i doing something wrong. Do you need more info to help me?
bc.add_to_cart = (data,next) => {
let payload = {
line_items: data.line_items,
option_selections: data.option_selections,
gift_certificatesL: null
}
return bc_v3.post(`/carts/${data.cartId}/items`, payload).then(data => {
return data; // data only show initial product cost
}).catch(next);
};
EDIT
below i am posting the results of GET carts/id u will see that the lineItem (id: 125) shows the original price, 29.95. Immediately after getting the cart I did a request to GET /catalog/products/125 — that one shows the updated price.
GET: carts/${cartId}
{
"data": {
"id": "15219c6d-51a8-4267-a38c-29fe62a49182",
"customer_id": 0,
"email": "",
"currency": {
"code": "USD"
},
"tax_included": false,
"base_amount": 409.7,
"discount_amount": 0,
"cart_amount": 409.7,
"coupons": [],
"line_items": {
"physical_items": [
{
"id": "d755137f-b09c-4a02-9da6-cab8da1ae332",
"parent_id": null,
"variant_id": 89,
"product_id": 124,
"sku": "test_config",
"name": "Test Configurable item",
"url": "http://fornida.mybigcommerce.com/test-configurable-item/",
"quantity": 2,
"taxable": true,
"image_url": "https://cdn7.bigcommerce.com/s-2bihpr2wvz/products/124/images/389/overview-3-lg-c__55453.1534430965.220.290.jpg?c=2",
"discounts": [],
"coupons": [],
"discount_amount": 0,
"coupon_amount": 0,
"list_price": 115,
"sale_price": 115,
"extended_list_price": 230,
"extended_sale_price": 230,
"is_require_shipping": true
},
{
"id": "eb5695d6-85e5-4b58-891b-a4bd8b48c56e",
"parent_id": null,
"variant_id": 90,
"product_id": 125,
"sku": "test_compt_1",
"name": "test component 1",
"url": "http://fornida.mybigcommerce.com/test-component-1/",
"quantity": 6,
"taxable": true,
"image_url": "https://cdn7.bigcommerce.com/r-03b8fdf5d1037c0feebbcedfd701c709422a962e/themes/ClassicNext/images/ProductDefault.gif",
"discounts": [],
"coupons": [],
"discount_amount": 0,
"coupon_amount": 0,
"list_price": 29.95,
"sale_price": 29.95,
"extended_list_price": 179.7,
"extended_sale_price": 179.7,
"is_require_shipping": true
}
],
"digital_items": [],
"gift_certificates": []
},
"created_time": "2018-08-23T15:41:10+00:00",
"updated_time": "2018-08-23T18:57:55+00:00"
},
"meta": {}
}
GET /catalog/products/125
{
"data": {
"id": 125,
"name": "test component 1",
"type": "physical",
"sku": "test_compt_1",
"description": "<p>Type a description for this product here...</p>",
"weight": 2,
"width": 0,
"depth": 0,
"height": 0,
"price": 125,
"cost_price": 0,
"retail_price": 0,
"sale_price": 0,
"map_price": 0,
"tax_class_id": 0,
"product_tax_code": "",
"calculated_price": 125,
"categories": [
23,
18
],
"brand_id": 0,
"option_set_id": 38,
"option_set_display": "right",
"inventory_level": 0,
"inventory_warning_level": 0,
"inventory_tracking": "none",
"reviews_rating_sum": 0,
"reviews_count": 0,
"total_sold": 0,
"fixed_cost_shipping_price": 0,
"is_free_shipping": false,
"is_visible": true,
"is_featured": false,
"related_products": [
-1
],
"warranty": "",
"bin_picking_number": "",
"layout_file": "product.html",
"upc": "",
"mpn": "",
"gtin": "",
"search_keywords": "",
"availability": "available",
"availability_description": "",
"gift_wrapping_options_type": "any",
"gift_wrapping_options_list": [],
"sort_order": 0,
"condition": "New",
"is_condition_shown": false,
"order_quantity_minimum": 0,
"order_quantity_maximum": 0,
"page_title": "",
"meta_keywords": [],
"meta_description": "",
"date_created": "2018-08-15T13:46:57+00:00",
"date_modified": "2018-08-23T18:22:52+00:00",
"view_count": 7,
"preorder_release_date": null,
"preorder_message": "",
"is_preorder_only": false,
"is_price_hidden": false,
"price_hidden_label": "",
"custom_url": {
"url": "/test-component-1/",
"is_customized": false
},
"base_variant_id": 90,
"open_graph_type": "product",
"open_graph_title": "",
"open_graph_description": "",
"open_graph_use_meta_description": true,
"open_graph_use_product_name": true,
"open_graph_use_image": true
},
"meta": {}
}

Answer 1

Updating the price of an item in the control panel or using the API will not change the price in an existing cart. If you create a new cart then the price will reflect the changes that were made.
The original cart where line_item is $25 dollars and tax is included as well to give a cart_amount of 29.12
{
"data": {
"id": "3a4c8e16-e279-4c30-83df-0010f6d54fba",
"customer_id": 0,
"email": "",
"currency": {
"code": "USD"
},
"tax_included": false,
"base_amount": 25,
"discount_amount": 0,
"cart_amount": 29.12,
"coupons": [],
"line_items": {
"physical_items": [
{
"id": "1e08875e-bf6f-4f1f-b8ba-b2e3cee10394",
"parent_id": null,
"variant_id": 363,
"product_id": 192,
"sku": "",
"name": "Smith Journal 13",
"url": "http://{store_hash}}.mybigcommerce.com/all/smith-journal-13/",
"quantity": 1,
"taxable": true,
"image_url": "https://cdn8.bigcommerce.com/s-{{store_hash}}/products/192/images/480/smithjournal1_1024x1024__85081__38998.1534344545.330.500.jpg?c=2",
"discounts": [],
"coupons": [],
"discount_amount": 0,
"coupon_amount": 0,
"list_price": 25,
"sale_price": 25,
"extended_list_price": 25,
"extended_sale_price": 25,
"is_require_shipping": true
}
],
"digital_items": [],
"gift_certificates": []
},
"created_time": "2018-08-24T14:41:17+00:00",
"updated_time": "2018-08-24T14:41:17+00:00"
},
"meta": {}
}
Update the line_item price /{store_hash}/v3/carts/{cartId}/items/{itemId}
{
"line_item":
{
"list_price": 30,
"quantity": 1,
"product_id": 192
}
}
Response - base_amount is now 30, and cart_amount is also updated to 34.96. This only changes the price for the cart and not the product
{
"data": {
"id": "3a4c8e16-e279-4c30-83df-0010f6d54fba",
"customer_id": 0,
"email": "",
"currency": {
"code": "USD"
},
"tax_included": false,
"base_amount": 30,
"discount_amount": 0,
"cart_amount": 34.96,
"coupons": [],
"line_items": {
"physical_items": [
{
"id": "1e08875e-bf6f-4f1f-b8ba-b2e3cee10394",
"parent_id": null,
"variant_id": 363,
"product_id": 192,
"sku": "",
"name": "Smith Journal 13",
"url": "http://{store_hash}.mybigcommerce.com/all/smith-journal-13/",
"quantity": 1,
"taxable": true,
"image_url": "https://cdn8.bigcommerce.com/s-{store_hash}/products/192/images/480/smithjournal1_1024x1024__85081__38998.1534344545.330.500.jpg?c=2",
"discounts": [],
"coupons": [],
"discount_amount": 0,
"coupon_amount": 0,
"list_price": 30,
"sale_price": 30,
"extended_list_price": 30,
"extended_sale_price": 30,
"is_require_shipping": true
}
],
"digital_items": [],
"gift_certificates": []
},
"created_time": "2018-08-24T14:41:17+00:00",
"updated_time": "2018-08-24T14:41:17+00:00"
},
"meta": {}
}