Paystack is a Splynx add-on which allows customers to pay for invoices via the payment gateway - https://paystack.com/.
The add-on can work with different credit cards and bank accounts if cards or bank accounts are saved in customer profiles.
The add-on allows you to charge all customers using Direct debit orders.
¶ Installation
The add-on can be installed in two methods: via the CLI or the Web UI of your Splynx server.
To install the Paystack add-on via CLI, the following commands can be used:
apt-get update
apt-get install splynx-paystack
To install it via the Web UI, navigate to Config → Integrations → Add-ons:
Locate or search for the splynx-paystack add-on and click the Install icon in the Actions column:
Click the OK, confirm button to begin the installation process:
¶ Configuration
After the installation process is complete, you need to configure the parameters in Config → Integrations → Modules list, as shown below:
Locate or search for the splynx-paystack add-on module and click the 
(Edit) icon in the Actions column:
Public and Secret keys can be obtained from your Paystack account:
The configuration of add-on Entry points can be found in Config → Integrations → Modules list, near the splynx_paystack_addon module item in the Actions column. Click the 
(Edit entry points) icon. More information about Modules list can be found here.
¶ Invoice payment
Once the configuration has been completed, customers can pay their invoices on the Customer Portal using the Paystack system in Finance → Invoices:
Or directly from the Portal Dashboard:
If everything goes well, you will see the status of the invoice marked as Paid (on the customer and admin portal):
Additionally, you can charge all customers in one click. To do this, navigate to Finance → Invoices, set the period, and click the Charge button, as shown below:
¶ Top up balance
Customers can top up their balances from the Dashboard on the Customer Portal with the Pay by button:
¶ Add-on logs
Paystack add-on logs can be found in Administration → Logs:
In Paystack Logs the different records can be viewed, like when a verification was performed or when a transaction was processed, etc.
¶ Direct payments
Using the payment links is the simplest way to accept payments made with a credit card or bank account. This feature is available in the Paystack add-on for paying Invoices and Proforma Invoices. It provides convenience and simplicity for your customers, increasing the likelihood of on-time payments.
To create a direct payment link, please use the patterns below:
To pay the Invoice:
by invoice ID
https://<splynx_domain_address>/paystack/direct-pay-invoice-by-id?item_id=<Invoice_id>
by invoice number
https://<splynx_domain_address>/paystack/direct-pay-invoice?item_id=<Invoice_number>
To pay the Proforma Invoice:
by proforma invoice ID
https://<splynx_domain_address>/paystack/direct-pay-proforma-by-id?item_id=<proforma_id>
by proforma invoice number
https://<splynx_domain_address>/paystack/direct-pay-proforma?item_id=<proforma_number>