PS 1.7.8.7 payment problems via Mollie

[pandorrah]

In 2022 I used PS 1.7.8.7 on PHP 7.4 and Mollie's payment module. Now that I'm working on the accounting and administration for 2022, I discovered the following problem:

some payment notifications in Back Office > Orders at the bottom of Payment show the following for a payment: (see image)

the amount to be paid is transferred in 2 parts to Mollie from the customer's account on the same date and at the same time; not a problem in itself, because the total amount is equal to both parts. So far so good...

However, with Mollie only the first part of the payment is registered!! The 2nd part is not listed with Mollie and will not be paid to you later!!

I approached Mollie about this and was turned down:
first it would be up to Prestashop, and after a screenshot of the payments I have to ask my customers for a copy of the bank statement of the transfer, and only then do they want to investigate further.

The problem is that it is not a one-off error/problem, but a much more frequent occurrence.
My question is:
1. why a payment is read or created by Prestashop in 2 parts,
2. how the customer has paid from his account,
3. why Mollie does not register that 2nd partial payment,
4. this problem A. lies with the bank, B. lies with Prestashop, C. lies with Mollie or with Mollie's module.

---

I'm really not going to bother my customers after months and sadly ask for a copy of their bank statement; I have more to do and I don't want to sound like a jerk. For the time being, I'll take those losses for granted and adjust my invoices with an extra discount; It is what it is.

What I am furious about is that Mollie is laying the problem with Prestashop and with me as a webshop owner.
I want to know:
A. if this only happens to me
B. how often this happens to others
C. what causes the error 1. Prestashop, 2. the Mollie module, 3. banking or, 4. Mollie itself
D. how this can be solved Mollie is not done with me yet, because this is costing me a lot of time and money now.

[pandorrah]

As far as i can see and backtrack in my situation (PS 1.7.8.7 on PHP 7.4) it is only the Mollie module that gives this specific error, of 2 partial payments in Prestashop orders with the same date and timestamp.

Mollie customer service indeed does blame Prestashop itself for any errors, and does not investigate if you report a problem; you yourself need to do all the work, in my case ask my customers for a copy of their bankstatements and send it to Mollie, which i will not and cannot do, due to privacy.

I am done with Mollie and i don't think that Prestashop has any blame whatsoever; other payment modules do not make the same errors, so it must be Mollie.

I already have downloaded the Adyen module as a permanent replacement for Mollie. (now working with PS 8.0.1 on PHP 8). It's time to get rid of Mollie as a payment provider in this case.

[pandorrah]

UPDATE:

after communicating with Mollie  I have made a bit more progress:

1. Prestashop generates and sends the payment, not Mollie. Mollie only processes the payment generated from Prestashop.

2. in my case (case study 1, Prestashop 1.7.8.7. on PHP 7.x) the total amount on the invoice is €93.30. Prestashop creates 2 partial payments, with an identical date and time stamp, namely €92.67 and €0.63. See image. Mollie receives and confirms the partial payment of €92.67 and transfers it to us. This is confirmed to the bottom left of the image.

The following questions remain:

A. how does Prestashop create and process a payment request?

B. how can this be created in parts? What causes this?

C. why does Prestashop send partial payments with an identical date and time stamp? How can this happen and how can it be prevented?

D. why is only the first part of the created partial payment sent, and never the second part? So I have had this problem several times in 2022 with multiple orders.

E. How can Prestashop communicate better with a payment module like Mollie? For example, by checking the total invoice amount against the payment requests created?

F. who is responsible for this? Not liable, because I use all software at my own risk, so that ship has sailed... But who is responsible for the programming in this one? Who is the point of contact? Again, I'll take the losses on this one. But I do want it resolved, and Prestashop will really have to come up with an answer.