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import { IncomingHttpHeaders } from 'http'
import { ConfigService } from '@nestjs/config'
import { HttpService } from '@nestjs/axios'
import { firstValueFrom } from 'rxjs'
import {
PaymentProvider,
CreatePaymentIntentResult,
PaymentConfig,
} from '../interfaces/payment-provider.interface'
import { PayPalProviderConfig } from '@fundraising/white-labeling'
@Injectable()
export class PayPalService implements PaymentProvider {
private readonly logger = new Logger(PayPalService.name)
constructor(
private configService: ConfigService,
private readonly httpService: HttpService,
) {}
private getCredentials(config?: PaymentConfig) {
const ppConfig = config as PayPalProviderConfig
const clientId = ppConfig?.clientId || this.configService.get<string>('PAYPAL_CLIENT_ID')
const clientSecret =
ppConfig?.clientSecret || this.configService.get<string>('PAYPAL_CLIENT_SECRET')
const sandbox =
ppConfig?.sandbox ?? this.configService.get<string>('PAYPAL_SANDBOX') === 'true'
Iif (!clientId || !clientSecret) {
this.logger.warn('PAYPAL_CLIENT_ID or PAYPAL_CLIENT_SECRET not defined')
}
return { clientId, clientSecret, sandbox }
}
private getBaseUrl(sandbox: boolean): string {
return sandbox ? 'https://api-m.sandbox.paypal.com' : 'https://api-m.paypal.com'
}
private async getAccessToken(config?: PaymentConfig): Promise<string> {
const { clientId, clientSecret, sandbox } = this.getCredentials(config)
const baseUrl = this.getBaseUrl(sandbox)
const auth = Buffer.from(`${clientId}:${clientSecret}`).toString('base64')
try {
const { data } = await firstValueFrom(
this.httpService.post(
`${baseUrl}/v1/oauth2/token`,
'grant_type=client_credentials',
{
headers: {
Authorization: `Basic ${auth}`,
'Content-Type': 'application/x-www-form-urlencoded',
},
},
),
)
return data.access_token
} catch (error) {
this.logger.error(`Error getting access token: ${error.message}`)
throw error
}
}
/**
* Creates a PayPal Order (equivalent to PaymentIntent)
*/
async createPaymentIntent(
amount: number,
currency: string = 'USD',
metadata: Record<string, any> = {},
config?: PaymentConfig,
): Promise<CreatePaymentIntentResult> {
try {
const accessToken = await this.getAccessToken(config)
const { sandbox } = this.getCredentials(config)
const baseUrl = this.getBaseUrl(sandbox)
// PayPal expects standard units (e.g. 10.00), not cents.
// Assuming amount passed is in CENTS.
const amountUnit = (amount / 100).toFixed(2)
const payload = {
intent: 'CAPTURE',
purchase_units: [
{
amount: {
currency_code: currency.toUpperCase(),
value: amountUnit,
},
custom_id: JSON.stringify(metadata), // Storing metadata in custom_id or just relying on local DB
},
],
}
const { data } = await firstValueFrom(
this.httpService.post(`${baseUrl}/v2/checkout/orders`, payload, {
headers: {
Authorization: `Bearer ${accessToken}`,
'Content-Type': 'application/json',
},
}),
)
return {
id: data.id,
// PayPal doesn't have a 'client_secret' in the same way Stripe does for some flows,
// but for standard JS SDK, the Order ID is enough.
// We will return the ID as the secret too or null. Use ID for both to be safe.
clientSecret: data.id,
}
} catch (error) {
this.logger.error(`Error creating PayPal order: ${error.message}`)
throw error
}
}
// Verification via API
async constructEventFromPayload(
headers: IncomingHttpHeaders | string,
payload: Buffer,
config?: PaymentConfig,
): Promise<any> {
const ppConfig = config as PayPalProviderConfig
const webhookId = ppConfig?.webhookId || this.configService.get<string>('PAYPAL_WEBHOOK_ID')
if (!webhookId) {
this.logger.warn('PAYPAL_WEBHOOK_ID not set. Skipping verification (INSECURE).')
return JSON.parse(payload.toString())
}
const accessToken = await this.getAccessToken(config)
const { sandbox } = this.getCredentials(config) // Get sandbox status
const baseUrl = this.getBaseUrl(sandbox)
const body = JSON.parse(payload.toString())
const verificationBody = {
auth_algo: headers['paypal-auth-algo'],
cert_url: headers['paypal-cert-url'],
transmission_id: headers['paypal-transmission-id'],
transmission_sig: headers['paypal-transmission-sig'],
transmission_time: headers['paypal-transmission-time'],
webhook_id: webhookId,
webhook_event: body,
}
try {
const { data: result } = await firstValueFrom(
this.httpService.post(
`${baseUrl}/v1/notifications/verify-webhook-signature`,
verificationBody,
{
headers: {
Authorization: `Bearer ${accessToken}`,
'Content-Type': 'application/json',
},
},
),
)
if (result.verification_status !== 'SUCCESS') {
throw new Error('PayPal webhook verification failed: Invalid Signature')
}
return body
} catch (error) {
this.logger.error(`Webhook verification error: ${error.message}`)
throw error
}
}
async refundDonation(paymentId: string, config?: PaymentConfig): Promise<any> {
try {
const accessToken = await this.getAccessToken(config)
const { sandbox } = this.getCredentials(config)
const baseUrl = this.getBaseUrl(sandbox)
// Look up the capture ID associated with this Order ID
const { data: orderData } = await firstValueFrom(
this.httpService.get(`${baseUrl}/v2/checkout/orders/${paymentId}`, {
headers: { Authorization: `Bearer ${accessToken}` },
}),
)
// Find capture ID from purchase units
const captureId = orderData.purchase_units?.[0]?.payments?.captures?.[0]?.id
if (!captureId)
throw new Error('No capture found for this order. Has it been captured?')
const { data } = await firstValueFrom(
this.httpService.post(
`${baseUrl}/v2/payments/captures/${captureId}/refund`,
{},
{
headers: {
Authorization: `Bearer ${accessToken}`,
'Content-Type': 'application/json',
},
},
),
)
return data
} catch (error) {
this.logger.error(`Error refunding PayPal donation: ${error.message}`)
throw error
}
}
}
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