How to open Shopify checkout and payment options

[abhishekraics001]

I am facing difficulty adding items in the cart as not finding the right way to get checkout. If someone helps me to get it done it's proud.

[abhishekraics001]

Below is the list of methods but not getting checkoutIDs out of them and i need help on an urgent basis. i will pay for same

ShopifyCheckout shopifyCheckout = ShopifyCheckout.instance; Future<Checkout> getCheckoutInfoQuery({String checkoutId}) Future<Checkout> getCheckoutInfoWithAvailableShippingRatesQuery({String checkoutId}) Future<List<Order>> getAllOrders({String customerAccessToken}) Future checkoutLineItemsReplace({String checkoutId, List<Map<String,dynamic>> checkoutLineItems}) Future checkoutCustomerAssociate({String checkoutId, String customerAccessToken}) Future checkoutCustomerDisassociate({String checkoutId}) Future checkoutDiscountCodeApply({String checkoutId, String discountCode}) Future checkoutDiscountCodeRemove({String checkoutId}) Future<String> createCheckout() Future checkoutGiftCardAppend(String checkoutId, List<String> giftCardCodes) Future checkoutGiftCardRemove(String appliedGiftCardId, String checkoutId) Future shippingLineUpdate(String checkoutId, String shippingRateHandle) Future checkoutCompleteFree(String checkoutId) Future updateAttributes(String checkoutId, {bool allowPartialAddresses, Map<String, String> customAttributes, String note})