Guide to integrating payment systems (Stripe, PayPal) on your site

Two systems that do not talk produce two truths: stock in the shop says one thing, the site another; the CRM has a lead the ERP never saw. Integrations exist to kill that double entry — not to add another dashboard nobody watches.

A solid integration is a mapped flow, tested failures and a named person when an alert fires. Jargon-free: one happy path, clear field mapping, a runbook for when it breaks.

One flow, then expand

Pick orders, customers or invoices. Map fields both ways. Decide what happens on conflict. Test failure modes before you celebrate «connected».

Write a one-page runbook: who gets the alert, what to check, when to pause sync. Without that, night failures become morning blame.

Vendors and boundaries

If an external vendor enters, clarify who owns configurations, prompts, mappings and logs. Avoid opaque dependencies. A good partner leaves the company more autonomous at ninety days, not more tied to endless tickets to change one rule.

A detail that makes the difference

Block calendar time for the pilot. Without dedicated slots the project stays «between other things» and never really starts. The operating owner updates status every week in five minutes: done, blocked, next step. It is not elegant. It works.

What to leave out on purpose

The first release is not the moment to prove everything the tool can do. Leave out features without an owner, integrations to little-used systems, automations on rare exceptions and aesthetic reports not tied to a decision. Expanding after the numbers is courage. Expanding before is anxiety dressed as ambition.

Dirty data, dirty results

If records and inputs are messy, any automation or language model amplifies the mess. Dedicate an explicit block to minimal clean-up on the MVP perimeter: duplicates, required fields, out-of-range values. That is not «IT work». It is operational truth.

Training that sticks

Short sessions on the team's real cases. A checklist within reach. A super-user per area for the first fifteen days. Avoid catalogue courses that end in a certificate and zero change the following Tuesday.

How you know you are improving

Do not multiply dashboards. Pick a few indicators tied to the process you are touching — on integrating payment systems, cycle time, output quality and adoption of the official flow usually suffice. Set baseline in week zero. Review at thirty days. If numbers do not move, change process and inputs before you change the tool.

After the pilot: expand without losing the thread

Widen only if the primary KPI improved, adoption beats the agreed threshold, the exception backlog is under control and the owner is still in charge. Otherwise reduce scope or strengthen training. A meeting every two weeks is enough: numbers, top exceptions, decisions. No status theatre.

Document the mapping or happy-path rules on a living page. When someone new joins, that page saves three weeks of oral tradition. Light governance is not bureaucracy: it is operating memory.

After the pilot: expand without losing the thread

Widen only if the primary KPI improved, adoption beats the agreed threshold, the exception backlog is under control and the owner is still in charge. Otherwise reduce scope or strengthen training. A meeting every two weeks is enough: numbers, top exceptions, decisions. No status theatre.

Document the mapping or happy-path rules on a living page. When someone new joins, that page saves three weeks of oral tradition. Light governance is not bureaucracy: it is operating memory.

Vendors and boundaries

If an external vendor enters, clarify who owns configurations, prompts, mappings and logs. Avoid opaque dependencies. A good partner leaves the company more autonomous at ninety days, not more tied to endless tickets to change one rule.

A detail that makes the difference

Block calendar time for the pilot. Without dedicated slots the project stays «between other things» and never really starts. The operating owner updates status every week in five minutes: done, blocked, next step. It is not elegant. It works.

What to leave out on purpose

The first release is not the moment to prove everything the tool can do. Leave out features without an owner, integrations to little-used systems, automations on rare exceptions and aesthetic reports not tied to a decision. Expanding after the numbers is courage. Expanding before is anxiety dressed as ambition.

Dirty data, dirty results

If records and inputs are messy, any automation or language model amplifies the mess. Dedicate an explicit block to minimal clean-up on the MVP perimeter: duplicates, required fields, out-of-range values. That is not «IT work». It is operational truth.

Training that sticks

Short sessions on the team's real cases. A checklist within reach. A super-user per area for the first fifteen days. Avoid catalogue courses that end in a certificate and zero change the following Tuesday.

How you know you are improving

Do not multiply dashboards. Pick a few indicators tied to the process you are touching — on integrating payment systems, cycle time, output quality and adoption of the official flow usually suffice. Set baseline in week zero. Review at thirty days. If numbers do not move, change process and inputs before you change the tool.

How you know you are improving

Do not multiply dashboards. Pick a few indicators tied to the process you are touching — on integrating payment systems, cycle time, output quality and adoption of the official flow usually suffice. Set baseline in week zero. Review at thirty days. If numbers do not move, change process and inputs before you change the tool.

After the pilot: expand without losing the thread

Widen only if the primary KPI improved, adoption beats the agreed threshold, the exception backlog is under control and the owner is still in charge. Otherwise reduce scope or strengthen training. A meeting every two weeks is enough: numbers, top exceptions, decisions. No status theatre.

Document the mapping or happy-path rules on a living page. When someone new joins, that page saves three weeks of oral tradition. Light governance is not bureaucracy: it is operating memory.

Vendors and boundaries

If an external vendor enters, clarify who owns configurations, prompts, mappings and logs. Avoid opaque dependencies. A good partner leaves the company more autonomous at ninety days, not more tied to endless tickets to change one rule.

A detail that makes the difference

Block calendar time for the pilot. Without dedicated slots the project stays «between other things» and never really starts. The operating owner updates status every week in five minutes: done, blocked, next step. It is not elegant. It works.

What to leave out on purpose

The first release is not the moment to prove everything the tool can do. Leave out features without an owner, integrations to little-used systems, automations on rare exceptions and aesthetic reports not tied to a decision. Expanding after the numbers is courage. Expanding before is anxiety dressed as ambition.

Dirty data, dirty results

If records and inputs are messy, any automation or language model amplifies the mess. Dedicate an explicit block to minimal clean-up on the MVP perimeter: duplicates, required fields, out-of-range values. That is not «IT work». It is operational truth.

Training that sticks

Short sessions on the team's real cases. A checklist within reach. A super-user per area for the first fifteen days. Avoid catalogue courses that end in a certificate and zero change the following Tuesday.

Training that sticks

Short sessions on the team's real cases. A checklist within reach. A super-user per area for the first fifteen days. Avoid catalogue courses that end in a certificate and zero change the following Tuesday.

How you know you are improving

Do not multiply dashboards. Pick a few indicators tied to the process you are touching — on integrating payment systems, cycle time, output quality and adoption of the official flow usually suffice. Set baseline in week zero. Review at thirty days. If numbers do not move, change process and inputs before you change the tool.

After the pilot: expand without losing the thread

Widen only if the primary KPI improved, adoption beats the agreed threshold, the exception backlog is under control and the owner is still in charge. Otherwise reduce scope or strengthen training. A meeting every two weeks is enough: numbers, top exceptions, decisions. No status theatre.

Document the mapping or happy-path rules on a living page. When someone new joins, that page saves three weeks of oral tradition. Light governance is not bureaucracy: it is operating memory.

In short: what to do Monday morning

Short version to bring to a meeting.

Steps

1. Choose one flow (orders/customers/invoices).
2. Map fields + conflict rules.
3. Test failure modes.
4. Publish runbook + alert owner.
5. Expand only if the first flow holds.

Quick checklist

• Goal written down.
• Owner active.
• MVP defined.
• Pilot planned.
• KPI baseline set.

KPIs (max three)

• Average process time (before/after).
• Error or rework rate.
• % usage of the official flow.

Practical value (and the next step)

Connecting two systems has one job: a single truth for the data that matters. Practical value is less copy-paste, fewer errors and fewer «but the ERP said something else» moments.

Pick one flow (orders, customers or invoices), map fields, test failures and name who acts when an alert fires. Expand only if the first flow holds.

If you want a second opinion on the scope of your case, Foggetti Studio can help you read the current state and define a realistic MVP.