> For the complete documentation index, see [llms.txt](https://docs.nexusglobalpayments.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nexusglobalpayments.org/payment-processing.md).

# Payment Processing

- [Key Points](https://docs.nexusglobalpayments.org/payment-processing/key-points.md)
- [Accounts & Relationships](https://docs.nexusglobalpayments.org/payment-processing/accounts-and-relationships.md)
- [Value limit of a Nexus payment](https://docs.nexusglobalpayments.org/payment-processing/maximum-value-of-a-nexus-payment.md)
- [Payment Flow](https://docs.nexusglobalpayments.org/payment-processing/payment-flow-happy-path.md)
- [Detailed Flow in Source Country (Sending)](https://docs.nexusglobalpayments.org/payment-processing/payment-flow-happy-path/detailed-flow-in-source-country-sending.md)
- [Detailed Flow in Destination Country (Receiving)](https://docs.nexusglobalpayments.org/payment-processing/payment-flow-happy-path/detailed-flow-in-destination-country-receiving.md)
- [Booking flow for Source PSPs](https://docs.nexusglobalpayments.org/payment-processing/payment-flow-happy-path/booking-flow-for-source-psps.md)
- [Notifying FXPs of completed payments](https://docs.nexusglobalpayments.org/payment-processing/payment-flow-happy-path/notifying-fxps-of-completed-payments.md)
- [Validations, Duplicates & Fraud](https://docs.nexusglobalpayments.org/payment-processing/validations-duplicates-and-fraud.md)
- [High priority vs normal priority payments](https://docs.nexusglobalpayments.org/payment-processing/time-critical-vs-non-time-critical-payments.md)
- [Special Scenarios](https://docs.nexusglobalpayments.org/payment-processing/special-scenarios.md)
- [Payment setup for PSPs who provide their own FX](https://docs.nexusglobalpayments.org/payment-processing/payment-setup-for-psps-who-provide-their-own-fx.md)
- [Detailed processing flows](https://docs.nexusglobalpayments.org/payment-processing/payment-setup-for-psps-who-provide-their-own-fx/detailed-processing-flows.md)
- [Unsuccessful Payments (Exceptions)](https://docs.nexusglobalpayments.org/payment-processing/unsuccessful-payments-exceptions.md)
- [Rejects](https://docs.nexusglobalpayments.org/payment-processing/unsuccessful-payments-exceptions/rejects.md)
- [Recall Requests](https://docs.nexusglobalpayments.org/payment-processing/unsuccessful-payments-exceptions/recall-requests.md)
- [Returns](https://docs.nexusglobalpayments.org/payment-processing/unsuccessful-payments-exceptions/returns.md)
- [Disputes](https://docs.nexusglobalpayments.org/payment-processing/unsuccessful-payments-exceptions/disputes.md)
- [Reconciliation reports](https://docs.nexusglobalpayments.org/payment-processing/unsuccessful-payments-exceptions/reconciliation-reports.md)
- [Investigation & Enquiry](https://docs.nexusglobalpayments.org/payment-processing/investigation-and-enquiry.md)
- [Source IPSO to Nexus](https://docs.nexusglobalpayments.org/payment-processing/investigation-and-enquiry/source-ipso-to-nexus.md)
- [Nexus to Destination IPSO](https://docs.nexusglobalpayments.org/payment-processing/investigation-and-enquiry/nexus-to-destination-ipso.md)
- [Destination IPSO to Nexus](https://docs.nexusglobalpayments.org/payment-processing/investigation-and-enquiry/destination-ipso-to-nexus.md)
- [Nexus to Source IPSO](https://docs.nexusglobalpayments.org/payment-processing/investigation-and-enquiry/nexus-to-source-ipso.md)
- [Fees](https://docs.nexusglobalpayments.org/payment-processing/fees.md)
- [Role and responsibilities of the Instant Payment System Operator (IPSO)](https://docs.nexusglobalpayments.org/payment-processing/role-and-responsibilities-of-the-instant-payment-system-operator-ipso.md)
- [Ensuring settlement certainty](https://docs.nexusglobalpayments.org/payment-processing/ensuring-settlement-certainty.md)
- [Annex: 4-step vs 5-step Processes in Domestic Clearing and Settlement](https://docs.nexusglobalpayments.org/payment-processing/annex-4-step-vs-5-step-processes-in-domestic-clearing-and-settlement.md)
- [Annex: Sponsoring PSPs and Sponsored Entities](https://docs.nexusglobalpayments.org/payment-processing/annex-sponsoring-psps-and-sponsored-entities.md)