PayPal: implement the `PaymentStatus` transaction

[dmitrii-fediuk]

1. «PayPal October 2017» → «AlphaHub PayPal Account Configurations» → «Supported Transaction Types»

PaymentStatus – used to get Wallet ID to process CapturePayment

2. «PayPal October 2017» → «AlphaHub PayPal Account Configurations» → «Process» → «Merchant request Payment Status»

• The merchant can request status of the payment to the AlphaHub using Payment Status transaction (optional step).
• The AlphaHub requests details from PayPal by sending the token previously saved in APC database to identify the customer.
• PayPal returns details and the Payer ID associated to the previous transaction. The Payer ID (Unique PayPal buyer account identification number) will be used by the merchant to complete the payment.

3. «API Explorer» → POST PaymentStatus

[dmitrii-fediuk]

I need to resolve #52 first (The PayPal's PaymentStatus transaction is undocumented)

[dmitrii-fediuk]

52 (The PayPal's PaymentStatus transaction is undocumented) is solved!

So I am starting to work on the PaymentStatus transaction.

[dmitrii-fediuk]

I need to implement #63 first (Involve the Df\API framework in the AlphaCommerceHub integration).

[dmitrii-fediuk]

63 is implemented! (Involve the Df\API framework in the AlphaCommerceHub integration)

[dmitrii-fediuk]

Now I am blocked by the AlphaCommerceHub's issue: AlphaCommerceHub rejects the PayPal's PaymentStatus transaction: «No Processor flow found for Transaction type: PaymentStatus»

[dmitrii-fediuk]

The AlphaCommerceHub rejects the PayPal's PaymentStatus transaction: «No Processor flow found for Transaction type: PaymentStatus» issue is solved.

[dmitrii-fediuk]

I continue to work on this task.

[dmitrii-fediuk]

Implemented in 0.5.5.