Chasing overdue receivables in ERPNext today means living in the Accounts Receivable report, manually cross-checking the Payment Reminder feature, and emailing customers one at a time. ERPNext core does give you a credit-limit field on the Customer, an aging report, and a basic dunning document, but it stops well short of a real collections desk: there is no escalating multi-level cadence that fires on its own, no single worklist that ranks accounts by risk and days-overdue, no structured promise-to-pay record, and no way to place or release a hard credit hold with an audit trail. Credit controllers end up rebuilding that discipline in spreadsheets, which is exactly where receivables slip.

ECOSIRE builds a proper Frappe app that installs into your ERPNext site as its own module. We add DocTypes for your collections workflow — a Dunning Level configuration (escalation step, days-overdue trigger, tone, email template, whether it applies a hold), a Promise to Pay record linked to the customer and outstanding invoices, and a Collection Task worklist item — alongside custom fields on Customer and Sales Invoice so nothing forks your core data model. Scheduler events (hooks.py scheduler_events, typically a daily background job) walk the open Sales Invoices, compute aging buckets against each level's threshold, and generate or advance dunning notices; hooks.py doc_events on Payment Entry and Sales Invoice submission automatically close tasks, clear holds, and fulfil promise-to-pay commitments when cash arrives. Reminder emails render through Frappe Email Templates and the standard email queue, so they respect your outgoing account, sender identity and unsubscribe rules.

Credit enforcement is wired in where it actually bites: a server-side validation hook on Sales Order and Sales Invoice checks live outstanding balance plus the order value against the customer's limit and blocks or flags submission, with an override permission gated by a dedicated role. Client Scripts surface the customer's current exposure, oldest overdue invoice and promise status right on the transaction form so a sales user sees the risk before saving. The collections worklist is delivered as a Frappe report/list view with saved filters and aging-bucket columns (0-30 / 31-60 / 61-90 / 90+), and every action is exposed through whitelisted methods and the standard Frappe REST API so it integrates cleanly with dashboards, a portal, or an external notification service. Role Profiles and permission rules keep the credit controller, the sales rep and the finance manager each seeing and doing only what they should.

Because this is build-to-order, nothing ships until we agree on scope. We start with a short scoping call, map your dunning cadence, credit policy, hold rules and email templates to the DocTypes above, and confirm the target version — we support Frappe/ERPNext v15 and v16. We build on a staging bench, run UAT against your real aging data, and hand over installable source, a git repository, documentation and a training session. Typical delivery is 2 to 4 weeks from confirmed scope, and every build includes a post-go-live support window plus a rollback plan so the go-live is never a leap of faith.