Add skeleton of payment processing.

members-payments.scm

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+;;
+;; members-payments.scm
+;;
+;; Adding payment information to member records from bank account statement.
+;;
+;; ISC License
+;;
+;; Copyright 2023 Brmlab, z.s.
+;; Dominik Pantůček <dominik.pantucek@trustica.cz>
+;;
+;; Permission to use, copy, modify, and/or distribute this software
+;; for any purpose with or without fee is hereby granted, provided
+;; that the above copyright notice and this permission notice appear
+;; in all copies.
+;; 
+;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+;;
+
+(declare (unit members-payments))
+
+(module
+ members-payments
+ (
+  members-payments-process
+  )
+
+ (import scheme
+	 bank-account)
+
+ ;; Merges bank account statement into members payment keys. The
+ ;; payment key will be a list of transactions.
+ (define (members-payments-process mb ba)
+   (let loop ((mb mb)
+	      (transactions (bank-account-transactions ba)))
+     (if (null? transactions)
+	 mb
+	 (let* ((transaction (car transactions)))
+	   (loop mb
+		 (cdr transactions))))))
+
+ )