PaystackFees

A class for managing Paystack fees in your application.

Installation

Peer Dependency (required)

Install Joi which we have employed for validating parameters sent to functions in this library

npm install --save @hapi/joi

Now install the module

npm install --save paystack-fees

Sample Usage

const PaystackFees = require('paystack-fees');
// The lines below will create a new object that calculates fees based on the fee
// schedule for USD payments. The cap is set to an arbitrarily high number since there
// is no cap.
const paystackFees = (new PaystackFees())
            .withPercentage(0.035)
            .withAdditionalCharge(0)
            .withCap(1000000000000)
            .withThreshold(0);

// you can now calculate fees for an amount by calling the `calculateFor` function
const feesFor1000USD = paystackFees.calculateFor(100000);
// or the amount to be sent when we intend to be settled a target amount
const amountToSendToBeSettled50USD = paystackFees.addTo(5000);

Kind: global class

• PaystackFees
  • .withPercentage(percentage) ⇒
  • .withAdditionalCharge(additionalCharge) ⇒
  • .withThreshold(threshold) ⇒
  • .withCap(cap) ⇒
  • .addTo(amountInLowerDenomination) ⇒
  • .calculateFor(amountInLowerDenomination) ⇒

paystackFees.withPercentage(percentage) ⇒

set the percentage

Kind: instance method of PaystackFees
Returns: the current PaystackFees object
Throws:

• if percentage sent is invalid

Param	Type	Description
percentage	number	positive number less than 1

paystackFees.withAdditionalCharge(additionalCharge) ⇒

set the additional charge which will be added if the amount is over threshold

Kind: instance method of PaystackFees
Returns: the current PaystackFees object
Throws:

• if additional charge sent is invalid

Param	Type	Description
additionalCharge	number	0 or more

paystackFees.withThreshold(threshold) ⇒

set the threshold, beyond which additional charge will be added to fees.

Kind: instance method of PaystackFees
Returns: the current PaystackFees object
Throws:

• if threshold sent is invalid

Param	Type	Description
threshold	number	0 or more

paystackFees.withCap(cap) ⇒

set the cap

Kind: instance method of PaystackFees
Returns: the current PaystackFees object
Throws:

• if cap sent is invalid

Param	Type	Description
cap	number	positive number greater than or equal to 1

paystackFees.addTo(amountInLowerDenomination) ⇒

calculate amount to be sent to paystack to be settled the amount provided

Kind: instance method of PaystackFees
Returns: amount you should send in lower denomination
Throws:

• if amountInLowerDenomination sent is invalid

Param	Type	Description
amountInLowerDenomination	number	The amount we want to be settled after paystack deducts fees

Example

paystackFee.addTo(10000) // add fees so we can be settled 100 in higher denomination

paystackFees.calculateFor(amountInLowerDenomination) ⇒

Calculates the fee for an amount in lower denomination

Kind: instance method of PaystackFees
Returns: fees in lower denomination
Throws:

• if amountInLowerDenomination sent is invalid

Param	Type	Description
amountInLowerDenomination	number	The amount we want to send to paystack

Example

// calculate the charge that will be deducted if
// a local cards pays 100 naira
const amountInKobo = 10000; // 10000 kobo is 100 naira
paystackFee.calculateFor(amountInKobo);