adding attach preview

shared/models/attachModels/attachEnums/AttachBranch.ts

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+export enum AttachBranch {
+  MultiProduct = "multi_product",
+
+  OneOff = "one_off",
+
+  New = "new",
+  AddOn = "add_on",
+
+  // Same product
+  NewVersion = "new_version",
+  SameCustomEnts = "same_custom_ents",
+  SameCustom = "same_custom",
+  UpdatePrepaidQuantity = "update_prepaid_quantity",
+  Renew = "renew",
+
+  // Handle upgrades / downgrades
+  MainIsFree = "main_is_free",
+  MainIsTrial = "main_is_trial",
+  Upgrade = "upgrade",
+  Downgrade = "downgrade",
+}

shared/models/attachModels/attachEnums/AttachConfig.ts

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+import { AttachBranch } from "./AttachBranch.js";
+
+export enum ProrationBehavior {
+  Immediately = "immediately",
+  NextBilling = "next_billing",
+  None = "none",
+}
+
+export interface AttachConfig {
+  onlyCheckout: boolean;
+  carryUsage: boolean; // Whether to carry over existing usages
+  branch: AttachBranch;
+  proration: ProrationBehavior;
+  disableTrial: boolean;
+}

shared/models/attachModels/attachEnums/AttachFunction.ts

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+export enum AttachFunction {
+  CreateCheckout = "create_checkout",
+  AddProduct = "add_product",
+  UpdateEnts = "update_ents", // only update entitlements
+  UpdateProduct = "update_product", // update product
+  ScheduleProduct = "schedule_product",
+  UpdatePrepaidQuantity = "update_prepaid_quantity",
+  Renew = "renew",
+}
+
+/* Handle checkout / public error:
+1. New version, same custom, same custom ents, renew, update prepaid quantity
+
+2. 
+*/

shared/models/attachModels/attachPreviewModels.ts

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+import { AttachBranch } from "./attachEnums/AttachBranch.js";
+
+export interface AttachPreview {
+  branch: AttachBranch;
+  options: any;
+  new_items: any;
+}